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The exploration of dielectric ceramics with excellent dielectric responses at Gigahertz band and Terahertz band is becoming urgent for the upcoming 6th generation wireless communication. In this work, we propose a new approach to design novel dielectric ceramics by using the density functional theory. According to the analysis of Electron Localization Functions (ELF), Density of States (DOS) and crystal bond lengths, it indicates that the strategy of co-doping with lithium and fluorine will contribute to a much more stable crystal structure of Li 0.5 NaY 9 (SiO 4) 6 O 2 F 0.5 as compared to that of NaY 9 (SiO 4) 6 O 2. Furthermore, we report the innovative synthesis of a Li 0.5 NaY 9 (SiO 4) 6 O 2 F 0.5 oxyfluoride ceramic, a solid solution with a wide sintering temperature range, along with an in-depth analysis of its crystal structure, dielectric responses at both Gigahertz band and Terahertz band, which shows the promising application of Li 0.5 NaY 9 (SiO 4) 6 O 2 F 0.5 in the 6G wireless communication. [ABSTRACT FROM AUTHOR]

ABSTRACT The exceptional optoelectronic capabilities of all‐inorganic metal halide perovskite semiconductor components open up a multitude of possible applications. Among all the metal halides, the chloride of cesium cadmium has not been investigated in great detail. Here, we describe a straightforward method for creating CsCdCl3 perovskite single crystals using the slow evaporation solution growth approach. These were investigated by utilizing X‐ray powder diffraction, and optical and impedance spectroscopies. The creation of a single‐phase with a hexagonal‐type structure was verified by the X‐ray powder diffraction (XRPD) data. The compound's semiconductor characteristics were verified by the optical measurement, indicating a direct band‐gap value of about 3.16 eV. The absorption and reflectance spectrum was also used to calculate and explain the optical extinction coefficient, Urbach energy, and skin depth as functions of the input photon's wavelength. Besides, the impedance spectroscopy technique was employed to investigate the characteristics of this component, across a frequency range of 10−1 Hz to 106 Hz and at temperatures ranging from 313 K to 453 K. The frequency behavior of the AC conductivity, σac, was analyzed using the universal Jonscher law. The outcomes of the charge transport investigation on CsCdCl3 imply that the perovskite material possessed a quantum mechanical tunneling (QMT) model for T < 363 K and a large polaron tunneling (OLPT) paradigm for T > 363 K. A correlation between the ionic conductivity and the crystal structure was established and discussed. Ultimately, the low dielectric loss and high dielectric constant of CsCdCl3 make it a promising material for energy harvesting devices. [ABSTRACT FROM AUTHOR]

The novel double perovskite oxide SrEuTiFeO6 was synthesized using the solid‐state reaction method. X‐ray diffraction analysis, complemented by Rietveld refinement, confirmed that this material crystallizes in a cubic double perovskite structure with the Pm3̅m space group and revealed cationic disorder at both the A (Sr, Eu) and B (Ti, Fe) sites. Crystallite size and lattice strain were determined through various methods. Fourier‐transform infrared spectroscopy was utilized to examine vibrational modes and bond distortions within this material. Scanning electron microscopy showed a heterogeneous microstructure, with a wide distribution of grain sizes and shapes, resulting from the kinetics of the solid‐state synthesis. Energy dispersive X‐ray spectroscopy confirmed the material's homogeneity, stoichiometry, and chemical composition. UV–visible spectroscopy was used to investigate the optical properties of SrEuTiFeO6, identifying several characteristic optical transitions. The band gap energy and refractive index were found to be 2.08 eV and 2.60, respectively, indicating the material's potential for various applications. Additionally, the dielectric properties, including the relative dielectric constant and loss tangent, were thoroughly analyzed as functions of frequency and temperature. The electrical conductivity dispersion phenomenon was also analyzed according to Jonscher's power law, revealing the predominance of overlapping the large polaron tunneling mechanism. [ABSTRACT FROM AUTHOR]

Metal single‐atoms implanted on nitrogen‐doped carbon matrices (M‐NxCs) can effectively adjust local surface electrons and polarization relaxation through coordination structures to significantly enhance the electromagnetic wave (EMW) absorption properties of the materials. However, the precise construction of the geometric and electronic structures of metal single atoms and the discovery of the structure‐absorption relationship at the atomic level confront a huge challenge. Herein, this work summarizes the latest progress in metal single‐atom engineering of EMW absorbing materials via a comprehensive analysis of M‐NxCs in terms of design principles, modulation strategies, and structure‐performance correlations. Subsequently, it highlights the recent progress of several typical M‐NxCs as the EMW absorbing materials, aiming to achieve a complete understanding of the physical effects and atomic‐level absorption mechanisms. Finally, current key challenge and future directions of M‐NxCs are presented by focusing on the electromagnetic functional materials. This work provides new insights for the development of atomically dispersed absorbing materials for efficient electromagnetic response functionalities. [ABSTRACT FROM AUTHOR]

The dielectric response of M-hexaferrite nanoceramics is complex since it is determined by crystal structure and microstructure. We studied the dielectric behavior of Nd3+ modified Sr2 + Fe12O19 nanoceramics with ferric ions, responsible for magnetic properties, substituted by Sc3+ and Al3+. To compare the effect of different ionic radii we discussed the dielectric response of Sr0.95Nd0.05Fe12-xScxO19 and Sr0.95Nd0.05Fe12-xAlxO19 at the doping level of x = 1.08. The dielectric response was found to consist of four contributions: (i) Low-temperature dispersion of dielectric polarization created by doping-induced spin-canting. The polarization, described by the inverse Dzyaloshinskii-Moriya model, is in nanoceramics limited by the shape and size of the crystallites. (ii) Changes in relaxation modes of polar vacancies due to interaction with electric dipole moments modified by deformation of oxygen octahedra. (iii) Dielectric dispersion in room temperature range related to space charge relaxation in grain boundaries. (iv) High-temperature electric conductivity of the grain interiors. [ABSTRACT FROM AUTHOR]

High-voltage dielectric and AC conduction behaviors of epoxy resin (EP) insulation are beneficial for the design and application of solid-state power electronic devices. This study investigates the nonlinear dielectric response and AC conduction characteristics of EP. The dielectric relaxation characteristics, including permittivity and AC conductivity of the EP samples, were investigated using high-voltage dielectric spectroscopy and the ionic polarization model. The results demonstrate a nonlinear increase in the relative permittivity and AC conductivity concerning the AC electric field. The increase in AC conduction under a high-frequency electric field is attributed to the reduction in the threshold field for charge injection caused by elevated temperatures. Considering the dielectric response and carrier hopping, it is evident that the nonlinear dielectric response of EP primarily originates from the ionic process under high electric fields. Ionic polarization, in conjunction with ion-hopping conduction, enhances the dielectric loss at high frequencies and electric fields, thereby facilitating the nonlinear conversion of AC conduction. The equivalent free volume is likely to increase in high-frequency fields. This phenomenon leads to an increase in AC conduction and even dielectric breakdown. This study offers a pivotal theoretical framework for the design and application of high-frequency insulation. [ABSTRACT FROM AUTHOR]

Heterostructure design has been recognized as a promising strategy to reinforce the dielectric polarization response through the strengthened heterogeneous interface interaction. However, the controllable preparation of homogeneously distributed heterostructures in absorbers remains a great challenge. Herein, we proposed a moderate reduction strategy to synthesize a NiO/Ni heterostructure tightly embedded in MoO3–x nanorods in situ by controlling phase evolution of NiO to metallic Ni under the H2/Ar atmosphere. Profiting from the abundant NiO/Ni heterostructures that induced electron migration and redistribution at NiO/Ni interfaces, the NiO/Ni/MoO3–x absorbers show a strengthened interfacial polarization relaxation response. Enriched oxygen vacancies serve as dipole polarization centers to form independent electric dipole pairs, which are conductive to the enhancement of dipole polarization loss under the alternating electromagnetic filed. Additionally, the homogeneously distributed magnetic Ni species construct a magnetic coupling network and generate ferromagnetic resonance and eddy current loss to boost magnetic loss. Consequently, the resultant absorbers display superior electromagnetic wave absorption performances with a minimum reflection loss value of −64.18 dB and maximum absorption bandwidth up to 6.6 GHz with a thickness of 1.8 mm, effectively covering the whole Ku-band. The radar cross-section (RCS) simulations demonstrate the excellent radar signal suppression capability of NiO/Ni/MoO3–x absorbers and the maximum RCS reduction value reaching 21.3 dB at 0°. The obtained absorption properties almost surpass most of the reported composites with embedded heterostructures. This work provides a strategy for the preparation of multiple heterogeneous interfaces and presents a deep insight into the attenuation mechanisms of absorbers. [ABSTRACT FROM AUTHOR]

We synthesized polycrystalline samples of Ba0.97La0.02Ti1−xNb4x/5O3, denoted as BLTi1 − xNb4x/5, with varying doping levels (x = 0.00, 0.02, and 0.05) through the Molten-Salt process. Introducing niobium had a significant impact on the physical characteristics of the BLT polycrystalline ceramics. Analysis via X-ray diffraction (XRD) indicated the presence of a single phase across all doping concentrations. As the concentration of Nb increased, there was a noticeable decrease in the typical size of crystallites. Scanning electron microscopy (SEM) revealed the formation of non-uniform particles as conventional grain size decreased with doping. We then investigated dielectric properties concerning frequency and composition under zero bias potential. Dielectric dispersion observed was interpreted utilizing both the Koops phenomenological theory and the Maxwell-Wagner interfacial model. Overall, under zero bias potential, Nb doping significantly impacted the electrical conductivity of BLT polycrystalline materials. [ABSTRACT FROM AUTHOR]

In the pursuit of innovative smart polymer piezoelectric ceramic composites, we present a thorough examination of the physical, structural, and polarization characteristics of a novel flexible polymer ceramic composite comprising sodium-bismuth titanate (NBT) doped with 0.6 mass % CeO2 as ceramic fillers embedded in a poly (vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) polymer matrix. The incorporation of these fillers serves to increase both the mechanical strength and functional attributes of the resulting polymer-ceramic composites. Various volume percentages of ceramic fillers were employed, and the experimental effective dielectric permittivity results were systematically fitted to established theoretical models, including Maxwell, Clausius−Mossotti, Furukawa, and effective medium theory (EMT). Our findings reveal that the composite films exhibit exceptional piezo-, pyro-, and ferroelectric properties when compared to the pristine P(VDF-TrFE) copolymer. The optimum concentration of NBT-0.6 CeO2 filler was determined to be 0.2 vol fraction resulting in a remarkable enhancement of the key parameters. Specifically, the pyroelectric coefficient increased from 32 μC/m2K to 43 μC/m2K (a ∼35 % increment), remnant polarization surged from 80 mC/m2 to 166 mC/m2 (an impressive ∼110 % increment), and the piezoelectric constant (d33) elevated from −38 pC/N to 49 pC/N (a substantial ∼30 % increment). These findings signify the potential of these optimized samples for applications in high energy density capacitors and/or highly integrated and intelligent piezoelectric devices. This comprehensive investigation not only advances our understanding of the synergistic effects within polymer-ceramic composites but also underscores the potential of the proposed material system for practical applications, providing valuable insights for the development of advanced multifunctional materials.

A new frontier in tuning the electromagnetic response of carbon-based materials, particularly carbon nanotubes, consists in adding metallic clusters or nanoparticles at their external surface. This allows to change optical, dielectric and magnetic properties with potential applications in electronics and telecommunications for aeronautics. By resorting to first principles dynamical simulations, we provide a microscopic picture of the interaction at finite temperature between a carbon nanotube and Co aggregates mimicking the experimental coverage. The electronic structure evolution provides the absorption spectrum and the dielectric function for comparison with experiments and guidelines for tuning these composite systems.

Due to the limited availability and unequal distribution of lithium resources, a thorough investigation into the viability and financial feasibility of using lithium as a long-term, sustainable solution has been initiated. Our work was focused to prepare the solid polymer electrolyte systems using solvent cast technique and the ionic conductivity, dielectric properties were studied using impedance spectroscopy from 1 Hz to 10 MHz at various temperatures. XRD (X-ray diffractogram) and FTIR (Fourier transform infrared) characterization techniques have been carried out to confirm the electrolytes' complexation and functional groups, respectively. Morphological study and thermal analysis have been studied using SEM (scanning electron microscopy) and DSC (differential scanning calorimetry). The dielectric response of the samples was examined through dielectric constant (ε′), dielectric loss (ε″), modulus (M′ and M″) and relaxation time (τ). The electrical properties of polymer electrolytes complexed with salt concentration were changed remarkably. The ionic conductivity of KNO3-complexed polymer electrolytes has been enhanced and the maximum ionic conductivity (3.19 × 10–5 S/cm) was noticed for 3 wt% of KNO3 which could be attributed to high dissociation and maximum movement of ions. [ABSTRACT FROM AUTHOR]

This study is reporting the role of embedded ferroelectric ceramics Bi4Ti3O12 (BTO = 1–5 wt%) into the polyvinylidene fluoride (PVDF) composites on its structural, bonding, surface morphology, and dielectric response. Especially lead free flexible composite electrodes have lot of attention due to its high dielectric permittivity and energy storage density. X‐ray diffraction spectra confirms monophasic orthorhombic structure of composites, while Fourier transform infrared (FTIR) spectra confirms the bonding behavior. Scanning electron microscopy (SEM) images surface morphology of homogeneously distributed ceramic particles with interconnected network. Dielectric constant has been found to be improved from 9.56 to 13.73 for BTO5%PVDF95% composites at frequency of 1 kHz attributes promoted interfacial polarization of PVDF and effectively limited the charge leakage in the composites, implying promising applications in flexible electronic devices. [ABSTRACT FROM AUTHOR]

Bi1−xSrxFe1−yZryO3 (BSFZO, x = 0–0.2 and y = 0–0.2) polycrystalline materials were prepared using the sol–gel method. A thorough investigation was conducted into the impact of ion co-doping (Sr, Zr) on the structural, magnetic, and dielectric characteristics of BiFeO3. Rietveld analysis of XRD data revealed a rhombohedral structure with space group R3c. Measured M–H loops suggested room-temperature ferromagnetism in the BSFZO compound. With (Sr, Zr) co-doping, antiferromagnetic BiFeO3 transformed into a weak ferromagnetic material. The dielectric response (ε′(f) and ε″(f)) of the parent BiFeO3 samples showed an exponential decay with high permittivity values, whereas the doped compounds were found to exhibit step-like behaviour. The dielectric constant exhibited frequency-dependent behavior, demonstrating a decrease in the dielectric constant at 2 MHz. This reduction was attributed to the conductivity induced by the mixed valence. Detailed dielectric relaxation mechanisms are presented. [ABSTRACT FROM AUTHOR]

Graphene nanoplatelets/polydimethylsiloxane (GNPs/PDMS) nanocomposites foils are obtained by dispersing nanoplatelets of graphene (GNPs) into polydimethylsiloxane (PDMS) at a given GNPs concentration but at different curing times to study the effects of curing time on some their bulk and surface properties. Their appearance and morphology have been examined by optical and scanning electron microscopies, their wettability and roughness by the sessile drop method and profilometry, their bonds by µRaman and ATR-FTIR spectroscopies, their dielectric response by dielectric spectroscopy. In particular, optical and SEM images and roughness measurements indicate a roughened and hydrophobic surface at the shortest curing time that becomes less roughened, more uniform and less hydrophobic as curing time increases. ATR-FTIR and µRaman spectra reveal the absence of chemical interaction between GNPs and PDMS. The behavior of the PDMS real and imaginary parts of dielectric permittivity without and with GNPs and at increasing curing times seems to define the obtained GNPs/PDMS nanocomposites as low-loss materials. The obtained results show that the curing time significantly affects the filler distribution in the PDMS matrix and consequently the properties of the final nanocomposites. [ABSTRACT FROM AUTHOR]

Abstract Background The tissue response viewer (TRV) is a novel marker for ablation lesion quality that aims to classify lesions into transmural or nontransmural lesions (high or low dielectric response, HDR or LDR) using dielectric‐based tissue assessment. The objective of this study was to gain insight in the TRV by relating its outcomes to conventional ablation parameters. Methods Patients that had repeat ablation for atrial fibrillation with a dielectric imaging‐based mapping system were enrolled. All ablation data were downloaded from the mapping system and analyzed to explore associations between TRV outcomes and other ablation parameters. Results The cohort included 24 patients, in which 58 pulmonary veins and 8 superior vena cavas were targeted. A total of 388 energy applications were applied, resulting in 639 ablation points. The system classified 36% of ablation points as HDR and 44% as LDR. The system did not provide a dielectric response in 20%. The system's ability to provide a dielectric response was related to longer ablation duration and absence of dragging ablation. HDR (versus LDR) was multivariably associated with longer energy applications, higher mean ablation power, and lower wall thickness. Greater impedance drop was univariably associated with HDR. Conclusion Outcomes of the TRV are associated with conventional ablation parameters (e.g., duration and power) but also local wall thickness. Catheter stability seems important for successful lesion assessment with the TRV. Further reduction of missing outcomes and validation of the tool are warranted before widespread use.

The demand for self-powered, flexible, and wearable electronic devices has been increasing in recent years for physiological and biomedical applications in real-time detection due to their higher flexibility and stretchability. This work fabricated a highly sensitive, self-powered wearable microdevice with Poly-Vinylidene Fluoride-Tetra Fluoroethylene (PVDF-TrFE) nano-fibers using an electrospinning technique. The dielectric response of the polymer was improved by incorporating the reduced-graphene-oxide (rGO) multi-walled carbon nano-tubes (MWCNTs) through doping. The dielectric behavior and piezoelectric effect were improved through the stretching and orientation of polymeric chains. The outermost layer was attained by chemical vapor deposition (CVD) of conductive polymer poly (3,4-ethylenedioxythiophene) to enhance the electrical conductivity and sensitivity. The hetero-structured nano-composite comprises PVDF-TrFE doped with rGO-MWCNTs over poly (3,4-ethylenedioxythiophene) (PEDOT), forming continuous self-assembly. The piezoelectric pressure sensor is capable of detecting human physiological vital signs. The pressure sensor exhibits a high-pressure sensitivity of 19.09 kPa−1, over a sensing range of 1.0 Pa to 25 kPa, and excellent cycling stability of 10,000 cycles. The study reveals that the piezoelectric pressure sensor has superior sensing performance and is capable of monitoring human vital signs, including heartbeat and wrist pulse, masticatory movement, voice recognition, and eye blinking signals. The research work demonstrates that the device could potentially eliminate metallic sensors and be used for early disease diagnosis in biomedical and personal healthcare applications.

Lead-free (Na0.59K0.41)(Nb1-xSbx)O3 ceramic (x = 0 ÷ 0.12) were prepared by the solid phase reaction method. The influence of Sb concentration on the structure, microstructure and electrical properties of the ceramic was studied. Results indicate that the presence of pure perovskite phase was revealed by XRD patterns recorded for the ceramics, which also showed a shift in structure from orthorhombic to mixed rhombohedral and tetragonal with an increase in x value. At x = 0.06, the ceramics express the best microstructure, the particles were tightly packed with an average particle size of 1.76 µm. The (Na0,59K0,41)(Nb0,94Sb0,06)O3 ceramics have the best dielectric and ferroelectric properties: the ceramic density (r) is 4.48 g/cm3 (relative density: 98.7% of the theoretical value); highest dielectric constant at TC (emax) of 12031; dielectric constant at RT (ε) of 945; low dielectric loss (tanδ) of 0.15; and high remanent polarization (Pr) of 11,2 mC/cm2; and the reactance field (Ec) of 8.7 kV/cm, and the phase transition temperatures (TC) of 372 °C, and (TO-T) of 157 °C.

LC‐circuit‐based resonant metamaterials (MM) operating in the terahertz (THz) are proven to detect the presence of nanoparticles within the capacitive gap of nanoantennas, manifesting a red‐shift in the resonance frequency. Sensitivity reduction (reduced red‐shift) due to the interaction/coupling of the substrate's Fabry–Pérot (FP) oscillations with the MM resonance is discussed. This new discovery of coupling is more probable and intense in thicker semiconductor substrates used in standard complementary metal‐oxide semiconductor processes, due to the high density of the FP oscillations and thus the probability for coupling with the single MM resonance increases. This also results in reducing the quality factor (Q‐Factor) of MM resonance, as well as the dielectric response to nanoparticles spread on the MM surface, by reducing the resonance frequency shift (ΔF) and thus the sensitivity of resonant MM. A sensitivity restoration of the MM resonance's red‐shift by decoupling it from the FP oscillations after thinning down the substrate by standard backside polishing is shown. The research is based on a combination of rigorous CST system‐level simulations along with THz impedance spectroscopy laboratory experiments: up to a fivefold enhancement of sensitivity of the thinned substrate compared with the conventional thick substrates is shown. This work has potential applications in the high‐sensitivity detection of nanomaterials and bio‐sensing at ultra‐low concentrations. [ABSTRACT FROM AUTHOR]

Background: The tissue response viewer (TRV) is a novel marker for ablation lesion quality that aims to classify lesions into transmural or nontransmural lesions (high or low dielectric response, HDR or LDR) using dielectric‐based tissue assessment. The objective of this study was to gain insight in the TRV by relating its outcomes to conventional ablation parameters. Methods: Patients that had repeat ablation for atrial fibrillation with a dielectric imaging‐based mapping system were enrolled. All ablation data were downloaded from the mapping system and analyzed to explore associations between TRV outcomes and other ablation parameters. Results: The cohort included 24 patients, in which 58 pulmonary veins and 8 superior vena cavas were targeted. A total of 388 energy applications were applied, resulting in 639 ablation points. The system classified 36% of ablation points as HDR and 44% as LDR. The system did not provide a dielectric response in 20%. The system's ability to provide a dielectric response was related to longer ablation duration and absence of dragging ablation. HDR (versus LDR) was multivariably associated with longer energy applications, higher mean ablation power, and lower wall thickness. Greater impedance drop was univariably associated with HDR. Conclusion: Outcomes of the TRV are associated with conventional ablation parameters (e.g., duration and power) but also local wall thickness. Catheter stability seems important for successful lesion assessment with the TRV. Further reduction of missing outcomes and validation of the tool are warranted before widespread use. [ABSTRACT FROM AUTHOR]

To identify the parameters of the extended Debye model of XLPE cables, and therefore evaluate the insulation performance of the samples, the sparsity-promoting dynamic mode decomposition (SPDMD) method was introduced, as well the basics and processes of its application were explained. The amplitude vector based on polarization current was first calculated. Based on the non-zero elements of the vector, the number of branches and parameters including the coefficients and time constants of each branch of the extended Debye model were derived. Further research on parameter identification of XLPE cables at different aging stages based on the SPDMD method was carried out to verify the practicability of the method. Compared with the traditional differential method, the simulation and experiment indicated that the SPDMD method can effectively avoid problems such as the relaxation peak being unobvious, and possessing more accuracy during the parameter identification. And due to the polarization current being less affected by the measurement noise than the depolarization current, the SPDMD identification results based on the polarization current spectral line proved to be better at reflecting the response characteristics of the dielectric. In addition, the time domain polarization current test results can be converted into the frequency domain, and then used to obtain the dielectric loss factor spectrum of the insulation. The integral of the dielectric loss factor on a frequency domain can effectively evaluate the insulation condition of the XLPE cable. [ABSTRACT FROM AUTHOR]

Herein, Ti2CTx MXene‐Polyvinyl alcohol (PVA) nanocomposite films with different weight percent (wt%) of MXene loadings were successfully prepared using the facile solution casting method. The structural, morphological, optical, thermal, and tensile properties of the nanocomposite films were analyzed using FTIR, XRD, Raman, SEM, UV–Vis spectroscopy, TG‐DTA, mechanical tests, and so forth. The variation in dielectric constant, loss tangent, and AC conductivity of the nanocomposite films was analyzed in the range of 1 Hz to 10 MHz with the variation of temperature (30–150°C) and MXene concentrations (5–20 wt%) using impedance spectroscopy. The nanocomposite films showed a very high dielectric constant in the range of ~105 for lower frequency and very low dielectric loss in the range of 0–1 for higher frequency (100 kHz–10 MHz). The dielectric constant, loss tangent, and AC conductivity values increased at a certain temperature and further decreased with increase in temperature. The increase in filler concentration increased the values of these investigated electrical parameters but at a concentration of 20 wt%, the nanocomposite films reached the percolation limit, and hence a slight reduction in the dielectric properties was noticed. Moreover, the complex impedance spectroscopy studies of the nanocomposite films were also carried out and their corresponding circuit diagrams were fitted according to the obtained cole‐cole plots. [ABSTRACT FROM AUTHOR]

We show that CaCu 3 Ti 4 O 12 (CCTO) ceramics present either giant (>104) or moderate (∼102) dielectric permittivity ε' at room temperature (RT), depending on the grains resistivity. By sintering at 980 °C, a highly resistive bulk is obtained (resistivity of 5.8 GΩ cm) and no giant ε' is verified. A semiconducting phase develops into the grains by sintering at 1050 °C, with a remaining thin resistive phase, hence forming a core-shell bulk microstructure. By increasing the sintering temperature to 1100 °C, the semiconducting phase of the bulk grows at the expenditure of the insulating shell, forming the well-known Internal Barrier Layer Capacitance (IBLC) structure. It is therefore proved that the giant ε' in CCTO ceramics is linked to the grain boundaries dielectric response whose manifestation becomes resolved at RT when the bulk phase is semiconducting in nature. Such an effect is thermally originated during processing and related to Cu migration towards grain boundaries. [ABSTRACT FROM AUTHOR]

Different compositions of the nanocomposite lead-free multiferroic systems are fabricated by employing piezoelectric polyaniline (PANI) and magnetostrictive Ni0.5Co0.5Fe2O4 (NCF) by varying the NCF weight fraction. The current work reports the synthesis of xNCF:(1-x)PANI hybrid composite systems prepared via the physical blending method. X-ray powder diffraction (XRD) exhibits the presence of both; a polymeric amorphous phase of PANI (matrix) and a crystalline phase of inverse spinel ferrite NCF (filler) in the composites. The microstructure analysis along with the elemental composition of the samples are studied via Field emission scanning electron microscopy (FESEM) and Energy Dispersive X-ray Analysis (EDAX) respectively. Here, frequency-dependent dielectric permittivity exhibits percolation-type behavior where permittivity (ε′) attains a peak at a critical weight fraction (x = 0.3). The magnetic properties for the particular stoichiometric concentration (x = 0.3) of the composite exhibit a large enhancement in the saturation magnetization (Ms) of 75.22 emu g−1, while maintaining the soft ferromagnetism in the nanocomposite system. The switching behavior of electrical polarization in composite systems exhibits strong temperature dependence with a ferroelectric loop that appears to persist at even low temperatures (5 K). The remnant electrical polarization (Pr) is found to decrease with the increase in ferrite (NCF) concentration. Hence, the developed composite system at the high electric field exhibits both ferroelectric and ferromagnetic characteristics without significant conductive losses making it suitable for potential multiferroic and capacitor applications. [ABSTRACT FROM AUTHOR]

Relaxor ferroelectrics play an important role for technological applications, mainly for using in the fabrication of actuators, transducers and sensors. Therefore, there has been an increasing interest of the scientific community in the investigation of the physical properties of such system in order to better elucidate the observed intriguing and unsolved phenomena. In this work, relaxor Pb(Mg1/3Nb2/3)O3 (PMN) ceramic system was prepared and the dielectric properties have been studied in details as a function of frequency, temperature and magnitude of the DC-bias electric field. Results reveal that the temperature dependence of the dielectric permittivity can be successfully described in the whole analyzed temperature range (100–400 K) by using a macroscopic statistical model, which describe the dielectric response in relaxor systems with diffuse phase transition (DPT). By using this phenomenological model, the temperature and DC-bias electric field dependences of the dielectric permittivity have been also revisited, from the analysis of the DPT behavior, promoting a careful discussion on the nature of the phase transition in relaxors materials. The calculated sizes of the polar nanoregions (PNRs) suggest the development of a structural disorder in the studied system, which promote the high diffuse ferroelectric transition as the amplitude of the DC-bias electric field increases. [ABSTRACT FROM AUTHOR]

The demand to produce clean energy has been increasing over the last years due to the various climate changes, which are strongly afflicting the world. Therefore, it is necessary to implement new and alternative energy sources that contribute for the environment preservation. That is the case, for instance, of novel energy-storage devices, which could contribute for the current demand of clean energies. In fact, most of the system used nowadays are those lead-based materials, which are strongly pollutant and contribute for the environment contamination. In this way, the interest in the development and study of lead-free materials has become a real priority in the scientific community. The objective of the present work is to synthesize and investigate the physical properties of lead-free ferroelectric systems based on BaTiO3 (BT) with technological interest. In particular, the structural and dielectric properties have been investigated as a function of the Sn4+ content, used as a doping element in the BT hosting crystalline structure. The phase transition characteristics have been also analyzed in a wide temperature and frequency range. [ABSTRACT FROM AUTHOR]

The present work reports the influence of Lanthanum (La) substitution on the structural, optical, electrical, and magnetic properties of bismuth ferrite (BiFeO3) nanoparticles (NPs). The compositions of Bi1−xLaxFeO3 (0% < x < 20%) NPs, with 5% Bi-excess, were synthesized through sol–gel conventional route. The XRD results suggest the formation of rhombohedral perovskite structure (R3c space group) along with a minor secondary phase. The crystallite size calculated from XRD and FESEM was observed to decrease from 60.0 to 40.0 nm with an increase in La content. The bandgap calculated using UV–Vis spectroscopy was found to decrease with La doping, and PL spectroscopy infers formation of defects in La–BFO NPs. The P–E loop studies reveal that La-doped BFO exhibits ferroelectric behavior at room temperature. The various parameters such as spontaneous polarization, dielectric constant, and distribution parameter of relaxation time measured from the electrical investigation were found to increase up to 5% La doping BFO then start decreasing with further increase in the La content in BFO. The impedance spectra of La–BFO was fitted using the theory of Cole–Cole with R(C(R(QR)))(CR) model. It is observed that La-concentration above 5% generates excess space charge which might cross the threshold to start conduction resulting in degrading of multiferroic properties. The DC magnetization study revealed the ferromagnetic behavior of the samples at room temperature. It is observed that La substitution affects the shape of the magnetization hysteresis curve beyond 5% La-concentration, and transforming it to a neck-like formation providing evidence for the spin-canting effect in the samples. These results make La-doped BiFeO3 NPs a propitious candidate for the multiferroic applications like high-density data storage devices and supercapacitors. [ABSTRACT FROM AUTHOR]

Organic crystalline dielectric materials are attractive target in the field of materials chemistry. In their designing strategy, the molecular motion induced by the external dielectric field is required to maximize the polarization effect in the materials to realize a large dielectric constant. Especially, the molecular motion of curved-π aromatics such as C60 and their supramolecular complexes are the known to show characteristic smoothness in the solid state. In this context, we focused on the in-plane motion of the one of the representative buckybowl, sumanene (Sum) in its curve-to-curve-contacted columnar structure as the new platform of the motion for the emergence of dielectric response. The newly designed and synthesized fluorinated sumanene, 1,1-difluorosumanene (F2-Sum), which possesses two fluorine atoms on the same benzylic carbon of pristine sumanene showed a large dipole moment along the in-plane direction. Thermal analyses, variable temperature X-ray diffraction and IR measurements indicated the presence of in-plane motion of F2-Sum although no clear phase transition was involved. This thermal property of F2-Sum realized an anisotropic dielectric response with a Debye-type dielectric relaxation in the single crystalline state. Further trials to form the solid solution of Sum and F2-Sum in various mixing ratio realized the tuning of the dielectric property. [ABSTRACT FROM AUTHOR]

Hematite (α-Fe2O3) nanoparticles were synthesized using co-precipitation and sol–gel methods. X-ray diffraction (XRD) technique was employed to structural properties of the synthesized α-Fe2O3 nanoparticles and SEM(scanning electron microscopy) was used to analyze the morphological structure. The crystallite size is determined Sample-A (33 nm) and Sample-B (29 nm) by Scherer formula, while Volume of unit cell is measured 301.8 x106 pm3 and 301.8 x106 pm3 respectively. The X-ray density is found in the Sample-A 5.27 (g/cm3) and Sample-B 5.26 (g/cm3). The optical band gap energy measured 2.4–2.6 eV, calculated by the Tauc plot with the optical absorption data. The electrical characteristics of the samples were examined by using two probe methods and the possible impact of temperature on the electrical properties of α-Fe2O3 was investigated. Dielectric analysis reveals an inverse relationship between the permittivity of α-Fe2O3 samples and frequency that fulfills the Maxwell Wagner Model. The magnetic parameters were observed Ms = 9.29 emu, 1.72 emu and coercivity Hc = 1404(G) as well as Hc = 1040(G). The observed values of these factors indicate that the materials can be employed in a variety of applications such as catalysis, sensors and water purification.

Due to the temperature and frequency response of electromagnetic (EM) loss, how to realize the effective design of microwave absorption materials (MWAMs) at elevated temperature is highly desirable for practical applications. Herein, transition metal-doped titanium nitride (M-TiN, M = Fe or Co) fibers were fabricated, the distortion of TiN lattice could cause the adjustable charge enrichment, which played a profound influence on the dielectric response and EM microwave absorption (EMWA) performances. Benefiting from the negative correlation between dielectric loss and temperature, more loss mechanism could be introduced, which would effectively enhance dielectric loss and EMWA performances at elevated temperature. The optimal EMWA performances of Fe-TiN fibers/polydimethylsiloxane (PDMS) composites were realized with a wide temperature range (298–423 K): the reflection loss (RL) could reach 99% (RL < −20 dB) at 12.2 GHz with 1.8 mm, when the filler content was only 15.0 wt.%. Compared with the undoped-TiN fibers/PDMS and Co-TiN fibers/PDMS composites, the excellent EMWA of Fe-TiN fibers/PDMS composite could be attributed to the reasonably synergistic polarization loss and conduction loss. Based on systematic analysis of the variable-temperature EM parameters and EMWA performances, the optimization of EMWA performances in wide temperature domain could be realized by introducing appropriate polarization loss and its compensating. Hopefully, this work provides a new strategy for regulating the dielectric response and designing effective MWAMs at elevated temperature. [ABSTRACT FROM AUTHOR]

The optical characterization of gadolinium fluoride (GdF3) films is performed in a wide spectral range using heterogeneous data-processing methods (the ellipsometric and spectrophotometric measurements for five samples with thicknesses ranging from 20 to 600 nm are processed simultaneously). The main result of the characterization is the optical constants of GdF3 in the range from far infrared to vacuum ultraviolet, both in the form of a table and in the form of dispersion parameters of the universal dispersion model (UDM). Such reliable data in such a broad spectral range have not been published so far. The GdF3 films exhibit several defects related to the porous polycrystalline structure, namely, surface roughness and a refractive index profile, which complicate the optical characterization. The main complication arises from the volatile adsorbed components, which can partially fill the pores. The presented optical method is based on the application of the UDM for the description of the optical response of GdF3 films with partially filled pores. Using this dispersion model, it is possible to effectively separate the optical response of the host material from the response of the adsorbed components. Several recently published structural and dispersion models are used for optical characterization for the first time. For example, a model of inhomogeneous rough films based on Rayleigh–Rice theory or asymmetric peak approximation with a Voigt profile for the phonon spectra of polycrystalline materials. [ABSTRACT FROM AUTHOR]

This paper reviews a procedure that allows for extracting primary photoelectron or Auger electron emissions from homogeneous isotropic samples. It is based on a quantitative dielectric description of the energy losses of swift electrons travelling nearby surfaces in presence of stationary positive charges. The theory behind the modeling of the electron energy losses, implemented in a freely available QUEELS-XPS software package, takes into account intrinsic and extrinsic effects affecting the electron transport. The procedure allows for interpretation of shake-up and multiplet structures on a quantitative basis. We outline the basic theory behind it and illustrate its capabilities with several case examples. Thus, we report on the angular dependence of the intrinsic and extrinsic Al 2s photoelectron emission from aluminum, the shake-up structure of the Ag 3d, Cu 2p, and Ce 3d photoelectron emission from silver, CuO and CeO2, respectively, and the quantification of the two-hole final states contributing to the L3M45M45 Auger electron emission of copper. These examples illustrate the procedure, that can be applied to any homogeneous isotropic material. [ABSTRACT FROM AUTHOR]

To gain high dielectric constant, polymer composites with 1D fillers are researched for energy storage. However, high leakage conduction from polymer/filler interface and filler interconnection can induce high dielectric loss. For high dielectric constant and low dielectric loss, in this work, we raised a strategy of morphological synergy of fillers (1D catenulate semi-conductive CuO nano-filler and 0D insulating alumina nano-particles) to fabricate polymer-based ternary composites. Instead of 0D CuO, 1D CuO nano-chains with the improved specific surface area were employed for high dielectric constant via polymer/CuO interface polarization. Spherical alpha-alumina nano-particles were used for reducing polymer/CuO interface leakage conduction and depressing CuO percolation to gain low dielectric loss. Compared with rather high dielectric constant and dielectric loss in polymer/CuO binary composites, moderately high dielectric constant and rather low dielectric loss were achieved in ternary composites. Via excellent synergy of CuO and alumina, ternary composites showed more promising dielectric properties. Ternary composite with 9 wt% CuO and 3 wt% alumina exhibited a high dielectric constant of ~ 64 and low dielectric loss of ~ 0.16 at 20 Hz. This work might pave a road for large-scale preparation of high-performance composite dielectrics by morphological synergy of fillers. [ABSTRACT FROM AUTHOR]

The complex dielectric permittivity of a sintered ceramic tablet consisting of 70.5% BiFeO3, 27.7% Bi2Fe4O9 and 1.8% Bi25FeO40 was analyzed as a function of temperature from – 120 °C to 230 °C in two separate temperature runs. The results reveal a complicated dielectric response with two temperature activated relaxation processes. The first is purely Arrhenius relaxation related to hopping processes between Fe3+ and Fe2+ traps induced by oxygen vacancies at grain boundaries. The second process is more unusual. Its characteristic relaxation time follows a quasi-Vogel–Tammann–Fulcher temperature behavior and from fitting the critical temperature point is estimated at T 0 = 766 K . It is absent in the second temperature run. It can be related to dynamic rearrangements of domain boundaries between different crystallites in the ceramic. The results also reveal a ferroelectric phase transition that decayed with repeated heating cycles of the tablet. The ferroelectric phase transition in pure BiFeO3 is 1098 K, whereas the current results show it at 373 K. The origin of this reduction in the critical temperature of the phase transition is traced to locally induced strains on grain boundaries mainly because of unit cell size mismatch between BiFeO3 and Bi2Fe4O9. [ABSTRACT FROM AUTHOR]

Dielectric polarization and electric polarization of electrodes are the common features of polar materials. We described methods to analyze their contributions and showed that both dependencies on temperature of dielectric conductivity and electrode polarization and the exponents characterizing these dependencies are excellent markers of phase transitions. Proposed methods were applied to several compounds, such as liquid crystals, pharmacological compounds, monoalcohols, polyalcohols, and various thermodynamic phases. Common behavior was noted for materials under study. In similar phases, various substances have the same values of the exponents characterizing electric conductivity and contribution from the electrode polarization. These exponents show discontinuities at phase transition temperatures between crystal-like and liquid-like phases. [ABSTRACT FROM AUTHOR]

The preliminary results of an ongoing laboratory cable aging program are reported in this article. This work deals with the effect of simultaneous radiation–mechanical​ aging on the electrical and mechanical properties of XLPE/CSPE low-voltage unshielded nuclear power cables. The dielectric response, particularly the complex permittivity and the polarization/depolarization current (PDC), were investigated. At the same time, the Shore D hardness measurement was conducted as a mechanical property test. Cable samples were coincidingly aged under a bending diameter of 15 cm and a total dose of 240 kGy γ-irradiation at a 0.5 kGy/h dose rate. The real and imaginary parts of permittivity were investigated over a frequency range from 200 μHzto 1 Hz. The electrical parameters presented a monotonic increase with aging. Besides, the cable hardness has increased with increasing the radiation dose. Furthermore, the insulation conductivity has risen with aging, which strongly correlates with the imaginary permittivity at 1 mHz. The obtained results showed an excessive degradation of the cable samples under the combined radiation–mechanical aging as the insulation electrical and mechanical properties showed a good agreement.

• ZnWO 4 microwave dielectric ceramics of the crystal structures, phase evolution, the dielectric response and the lattice vibrational characteristics sintered at different temperatures were studied. • The lattice vibrational characteristics sintered at different temperatures were analyzed utilizing Raman and infrared reflection spectroscopy. • The four-parameter semiquantum (FPSQ) model was utilized to fit and simulate the intrinsic dielectric properties of the ZWO ceramics. They were compared with the measured and theoretical values calculated by Clausius-Mossotti (C-M) and damping (γ) equations. • The relationship between the structure and properties of the ZnWO 4 ceramics sintered at different temperatures were elucidated through the use of Raman spectroscopy, overcoming the limitation of solely textual description without mathematical quantification. The study meticulously examined the impact of varying sintering temperatures on the phase transformations, crystallographic configurations, dielectric response mechanisms, and lattice vibrational characteristics of the ZnWO 4 ceramics. Far-infrared reflectance spectra were fitted using a four-parameter semiquantum model to obtain the intrinsic dielectric properties. Moreover, the contribution to the dielectric properties for each vibrational mode was analyzed, indicating that the lower-frequency mode had the most contribution. The relationship linking the structural aspects to the properties of ZnWO 4 ceramics was elucidated through an analysis of the Raman spectral modes across a range of sintering temperatures, overcoming the limitation of solely textual description without mathematical quantification. When sintered at 1070 °C, the ZnWO 4 ceramic had the best dielectric properties: ε r = 14.81, Q×f = 34,239 GHz (f = 9.69 GHz), with the highest relative density of 96.95 %. [ABSTRACT FROM AUTHOR]

This study presented the one-step synthesis of sulphur (S) and nitrogen (N) dual-doped graphene using atmospheric thermal plasma. The doped graphene was synthesized in the magnetically rotating arc plasma with CS 2 as the sulphur source, N 2 as the nitrogen source and CH 4 as the carbon source. At the same reaction temperature, the concentrations of S and N in S and N dual-doped graphene were higher than those in S/ N -doped graphene, which indicated that the dual-doped mode had a promoting effect on the doping level. In addition, increasing the input power effectively increased the doping levels of S and N atoms, which were up to 15.0 at% and 6.9 at%, respectively, at an input power of 19 kW. The S and N dual-doped graphene displayed excellent microwave absorption capability, with an optimal reflection loss of −56.4 dB at 16.3 GHz, and the effective absorption bandwidth reached 5.7 GHz when the doping levels of S and N atoms were 12.2 at% and 5.1 at%. This simple and rapid method for preparing S and N dual-doped graphene might facilitate the application of heteroatom doped graphene. [Display omitted] • S and n dual-doped graphene was synthesized through a one-step process using atmospheric thermal plasma. • The highest doping levels of elemental S and N were 15.0 at% and 6.9 at%, respectively. • The optimum RL at 16.3 GHz was −56.4 dB and the EAB reached 5.7 GHz. [ABSTRACT FROM AUTHOR]

Recent experiment reveals that the dielectric response to the bias electric field has obvious dependence on the frequency, which is mainly manifested in strong field-enhanced effect and weak field-enhanced effect, and reveals the novel mechanism behind this behavior. We find that the strong field-enhanced effect is caused by electromechanical coupling resonance originating from field-induced rearrangement. Considering inherent multiscale inhomogeneity, multiscale polar nanoregions distribute in the KTN crystal, and we find that the dielectric permittivity can be increased by enhanced vibration caused by the resonance between the multiscale PNRs and electric field, resulting in weak field-enhance effect. In addition, the multiscale inhomogeneity can also cause local nonmonotonic behavior of dielectric response to the electric field. Our finding provides a better understanding for the field-driven dynamics of the multiscale PNRs and paves the way to develop promising electro-optic devices, deflectors and tunable device. [ABSTRACT FROM AUTHOR]

In this paper, CaWO 4 - x wt. % LiF (x = 0.5–3.0) microwave dielectric ceramics are prepared by conventional solid-state reaction at 850 °C. All the X-ray diffraction peaks are attributed to CaWO 4 , combined with the results of X-ray photoelectron spectroscopy and scanning electron microscope. They indicate that LiF forms liquid phase at high temperature, exists in amorphous phase, and the CaWO 4 - x wt. % LiF samples belong to the composite ceramics. With the increase of the LiF content, the liquid phase fills the pores of the ceramics and increases the compactness. Therefore, the quality factor increases from 59,055 GHz (x = 0.5) to 77,855 GHz (x = 3.0), and the dielectric constant decreases from 9.26 (x = 0.5) to 8.41 (x = 3.0). The lattice vibration characteristics of the CaWO 4 - x wt. % LiF samples are studied by Raman and infrared spectroscopy. The external modes associated with the vibration of the Ca–O bonds have the greatest influence on the dielectric response, as shown by the fitting results based on the four-parameter semi-quantum (FPSQ) model. In addition, the simulated intrinsic properties and measured values are in general agreement. When the x value increases, the dielectric constant decreases with the decrease of the bond length. The quality factor has a negative correlation with the FWHM value of the B g mode and a positive correlation with the packing fraction. Finally, the CaWO 4 -3 wt.% LiF sample has good compatibility with the silver powders at 850 °C, and high application value in the LTCC field. [ABSTRACT FROM AUTHOR]

This article describes a novel research method for evaluating the aging state of the primary insulation material of large generator stator bars based on combining dielectric response methods with the entropy weight method. Vacuum pressure impregnation (VPI) epoxy-mica insulation specimens subjected to different electrical aging time periods were characterized via frequency domain spectroscopy (FDS), polarization and depolarization current (PDC), and thermal stimulated depolarization current (TSDC) tests. The comprehensive characteristic (VPI) parameters obtained by calculating the characteristic dielectric response parameters using the entropy weight method were used to describe the aging state of the VPI epoxy-mica insulation. The results show that during electrical aging, microcosmic structural variations within the insulation directly manifested as changes in the characteristic dielectric response parameters and indirectly affected the comprehensive evaluation parameters of the entropy weight method. [ABSTRACT FROM AUTHOR]

A series of double-perovskite La2Co1−zFezMnO6 (z = 0, 0.2–1.0) ceramics were synthesized using a well-established sol–gel method. The series of samples with a monoclinic phase and a P21/n symmetry were characterized by XRD, FTIR, conductivity, and capacitance measurement to extract charge-transport and dielectric characteristics at room temperature. The obtained IR spectra fitted well with the Lorentz oscillator model to calculate the damping factor, optical frequency, and oscillator strength and compared with the theory, which gave better agreement. The calculated activation energies from the Arrhenius plot supported the semiconducting nature of all samples. The temperature and frequency-dependent dielectric parameters, such as the real part ( ε r ′ ), imaginary part ( ε ″ ) of the dielectric constant, dielectric loss (tanδ), and ac-conductivity (σac) were extracted. The dielectric constant ( ε r ′ ,     ε ″ ) and dielectric loss (tanδ) were enhanced at a low frequency, while the ac-conductivity (σac) displayed higher values at higher frequencies. The enhancement in the dielectric parameters with increasing iron concentrations arose due to the higher surface volume fraction of iron (Fe3+) ions than the cobalt (Co3+) ions. The radius of the Fe3+ (0.645 Å) was relatively higher than the Co3+ ions (0.61 Å), significantly influenced by the grains and grain boundaries, and enhanced the barrier for charge mobility at the grain boundaries that play a vital role in space charge polarization. [ABSTRACT FROM AUTHOR]

Ferroelectrics (FEs) are increasingly used in nonvolatile memory applications. However, the impact of the electric dipole switching on its material parameters, in particular on the dielectric response, is not fully understood. In this work, an analytical model, linking the dielectric response to the potential energy curve, is first used to qualitatively illustrate the nonconstant evolution of the dielectric response with applied electric field. Increasing precision, we then show from first-principles density functional theory simulations that defect-free FE materials undergo changes in potential energy near the FE switching that lead to vibrational modes softening, which impacts the dielectric response. In particular, we observe that the dielectric response $\varepsilon $ of an FE material with antialigned polarization increases as the applied electric field increases toward the coercive field. We incorporate this new insight in the time-dependent NLS-based predictions and demonstrate that this evolution of the dielectric response right before polarization reversal is required for a proper match between experiment and prediction of the capacitance–voltage (CV) characteristics of the metal–ferroelectric–metal (MFM) capacitor. [ABSTRACT FROM AUTHOR]

A convenient chemical precipitation route was applied to prepare cupric oxide nanoparticles using copper acetate as precursor material. The influence of the reaction conditions on the formation of CuO nanoparticles was studied. The particle size of cupric oxide varies between 7.79 and 23.83 nm depending on the sodium hydroxide amount. The crystallite size of CuO nanoparticles obtained by electrospinning and calcination was of 42.25 nm. X-ray diffraction, scanning electron microscopy, EDX, XPS, electronic absorption and emission spectra were used to discuss the structural, morphological and optical properties of the CuO nanostructures. The electrical characteristics of CuO nanoparticles were investigated by dielectric and conductivity measurements. The dielectric constant (ε ′) and loss (ε ") were found to be decreased as the frequency increased. The photocatalytic activity of CuO nanoparticles was investigated following the degradation of ciprofloxacin. [ABSTRACT FROM AUTHOR]

Terahertz (THz) electric inductive-capacitive (ELC) resonant metamaterials (MMs) are well established tools that can be used to detect the presence of dielectric material (e.g., nanoparticles, bioparticles, etc.) spread on their surfaces within the gap of the capacitive plates of a nanoantenna array. In THz spectroscopy, the amount of the red shift in the resonance frequency (ΔF) plays an important role in the detection of nanoparticles and their concentration. We introduce a new LC resonant MM architecture in the ELC category that maximizes dielectric sensitivity. The newly proposed architecture has an octahedral structure with uniform capacitive gaps at each forty-five-degree interval, making the structure super-symmetric and polarization independent. The inductor core is condensed into a central solid circle connecting all the eight lobes of the octahedron, thereby completing the LC circuit. This ELC resonator has very large active areas (capacitor-gaps), with hotspots at the periphery of each unit cell. The MM structure is repeated in a clustered fashion, so that the peripheral hotspots are also utilized in dielectric sensing. This results in enhancing the quality factor of MM resonance, as well as in increasing ΔF. The research comprises a combination of rigorous system-level simulations along with THz impedance spectroscopy laboratory experiments. We achieved a highly sensitive MM sensor with sensitivity reaching 1600 GHz/RIU. This sensor is fully CMOS compatible and has promising potential applications in high-sensitivity bio-sensing, characterization of nanoparticles, and ultra-low-concentration dielectrics detection, as well as in sensing differential changes in the composition of substances deposited on the metasurface., (© 2024 The Author(s). Advanced Science published by Wiley‐VCH GmbH.)