7 results
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2. Dielectric properties of La2MoO6 ceramics at microwave frequency for application in wireless sensors.
- Author
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Wang, Yen-Wien, Chen, Yih-Chien, and You, Yu-Cheng
- Subjects
DIELECTRIC properties ,CERAMICS ,MICROWAVES ,PERMITTIVITY ,QUALITY factor ,GRAIN size ,X-ray diffraction - Abstract
The microwave dielectric properties of La
2 MoO6 ceramics were investigated in preparation for their application in mobile communication. La2 MoO6 ceramics were prepared by the conventional solid-state method under varied sintering conditions. The X-ray diffraction peaks of La2 MoO6 ceramic did not vary significantly with sintering conditions. The average grain size of La2 MoO6 ceramics increased with increasing the sintering temperature and duration. The maximum density of 5.67 g/cm3 , the dielectric constant ( ε r ) of 14.1, the quality factor (Q × f) of 68,000 GHz, and the temperature coefficient of resonant frequency ( τ f ) of −56 ppm/°C had been attained when La2 MoO6 ceramics that sintered at 1300 °C for 4h. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
3. Temperature dependent transition effects on the dielectric properties of PVA/Y2O3 polymer nanocomposites.
- Author
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Kumar, Y. Ravi, Dinesh, Sunkari, Sk, Jameer Basha, and Pasha, S. K. Khadheer
- Subjects
POLYMERIC nanocomposites ,DIELECTRIC properties ,TRANSITION temperature ,PERMITTIVITY ,POLYVINYL alcohol ,PHASE transitions ,DIELECTRIC loss - Abstract
This study investigates the dielectric properties, including dielectric constant (ɛ′), dielectric loss (ɛ″), tangent delta (tan δ), and AC conductivity (σ
ac ), of PVA/Y2 O3 polymer nanocomposites (PNCs). The dielectric behavior of the PNCs was examined as a function of frequency and temperature. The results revealed that the addition of Y2 O3 nanoparticles to the PVA matrix influenced the dielectric properties of the composites. In contrast to pure PVA, the PVA/Y2 O3 PNCs with a 15 wt% Y2 O3 loading exhibited high values of ɛ′, ɛ″, tan δ and σac are 647.49, 1607.48, 9.70 and 1.024 × 10−5 , respectively, at low frequency and at particular temperature. Furthermore, the electrical properties of PVA/Y2 O3 PNCs were also investigated using the Cole-Cole plots. These plots provide valuable insights into the complex impedance behavior and allow for comprehensive understanding of the electrical response of the nanocomposites. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
4. Influence of anion variation on dielectric response of amide functionalized benzimidazolium dicationic ionic liquids.
- Author
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Khandare, Yashvant Vitthal, Gaikwad, Vishwajit M., Khadheer Pasha, S. K., and Muskawar, Prashant Narayan
- Subjects
IONIC liquids ,DIELECTRICS ,BENZIMIDAZOLES ,DIELECTRIC properties ,PERMITTIVITY ,ENERGY storage - Abstract
The present work centered attention on novel ionic liquid (IL) based on dicationic benzimidazolium ion containing amide group (DBimIL) synthesized using dialkylation of N-ethyl benzimidazole to followed with anion exchange reaction. To explore the potential application of ILs, there is a great need to grasp their structural and physical properties. We have developed three different set of DBimIL based ionic liquids with chloride, hexafluorophosphate and perchlorate anions in aqueous media, respectively. Their structural features were studied using
1 H,13 C-NMR, FTIR, and HRMS spectroscopy, respectively. The temperature-dependent dielectric characteristics of ILs were closely examined angular frequency in the range of 0.6–125 rad/s from 30 to 150 °C. The relationship between the structural and dielectric properties of ILs established. The dielectric parameters like dielectric constant, dissipation factor and the real part of ac conductivity were found to be affected significantly with the tuning of anionic moieties of ionic liquids. The ability of materials to store a charge in electromagnetic field was measured. From dielectric and electrical studies, to bring to an end, especially in particular way that the present IL systems have an enormous potential for the designing of modern-day energy storage devices. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
5. Investigation of Sn and Zr co-doped Ba0.5 Sr0.5 TiO3 for dielectric, impedance and conductivity behaviour in temperature and frequency region of measurement.
- Author
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Das Pattanayak, M., Biswal, L., Roy, Niladri, Behera, Banarji, and Priyadarshini, Lipsa
- Subjects
DOPING agents (Chemistry) ,HOPPING conduction ,DIELECTRIC properties ,PERMITTIVITY ,SCANNING electron microscopes ,DIELECTRIC measurements ,DIELECTRIC relaxation - Abstract
In this report, we are presenting the effect of B-site co-doping with Sn and Zr (2% each) on frequency and temperature-dependent dielectric and electrical properties of Ba
0.5 Sr0.5 TiO3 (BST). The desired compound is synthesised following solid-state reaction route and the structural and micro-structural study of the resulting compound is done using X-ray diffractometer (XRD) and scanning electron microscope (SEM) technique. XRD study revealed that the parent structure of BST is mostly retained after co-doping. SEM micrograph analysis presented dense packing of grains of different sizes distributed all over the volume of compound formed. The compound was found to have a moderate value of dielectric constant and low tangent loss along with a near stable response of these dielectric properties over the studied frequency range, suggesting its possible application in tuneable matching networks and frequency agile antennas. Electrical properties study suggested a non-Debye type electrical response with a thermally activated conduction mechanism occurring in the material. The dependence of conductivity with temperature showed negative temperature coefficient of temperature behaviour of the compound and the ac conductivity spectrum followed Johnscher's power law. The variation of exponent with temperature suggested correlated barrier hopping conduction mechanism in the material. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
6. Synthesis, characterization, and dielectric studies of magnetic iron oxide nanoparticles.
- Author
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Sharma, Abhishek, Sahu, Govind, and Mahapatra, Shyama Prasad
- Subjects
IRON oxide nanoparticles ,IRON oxides ,DIELECTRICS ,BROADBAND dielectric spectroscopy ,ELECTRIC conductivity ,FERRIC oxide ,NANOPARTICLE size - Abstract
There are many nanoparticle preparation techniques such as the biological approach sol-gel method and physical methods, etc. However, the co-precipitation approach requires few chemical reagents and reaction time as well as produces highly pure products with comparatively lower costs among the available techniques. In present work co-precipitation method is use to synthesize magnetic iron oxide (Fe
3 O4 ) nanoparticles, followed by characterization to check its applicability and the presence of undesired substrate. UV–visible spectroscopy, scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), and Fourier-Transform Infrared Spectroscopy (FTIR) were examined to determine the synthesized Fe3 O4 nanoparticles. The nanoparticles' sizes lies between 1 nm to 100 nm, according to the SEM and HR-TEM analyses. XRD measurements verified the crystalline characteristics of the Fe3 O4 nanoparticles. Dielectric spectroscopy of synthesized Fe3 O4 nanoparticle pellets has been investigated at a wide frequency range 0.1 to 105 Hz. Capacitance and dielectric permittivity of Fe3 O4 nanoparticles decrease continuously with frequency as dipole gets less time to orient in the field. The dielectric permittivity of Fe3 O4 pellets increases up to 3 mm thickness and subsequently drops, perhaps because a rise in resistance. The electrical conductivity of Fe3 O4 rises exponentially with frequency. According to the dielectric studies, the dielectric permittivity and electrical conductivity of Fe3 O4 are greatly dependent on the thickness and extent of frequency. Additionally, the dielectric impedance of Fe3 O4 pellets has also been investigated as a function of frequency. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
7. Structural, dielectric characterization of BaFe2MnO6 double perovskite.
- Author
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Sahoo, Shubhashree, Sahoo, Lutu, Rautray, Tapash, Parida, B. N., and Parida, R.K.
- Subjects
DIELECTRIC devices ,DIELECTRICS ,DIELECTRIC properties ,PERMITTIVITY ,CERAMIC capacitors ,PEROVSKITE ,MANGANITE - Abstract
A polycrystalline ceramic oxide, BaFe2MnO6 was produced through a regular solid-state route. The phase creation in the synthesized substance was investigated through X-ray diffraction (XRD) technique. The present material has found with made up of a single phase orthorhombic structure. The electrical properties of the compound were recorded through an LCR meter for a broader range of frequencies and temperatures. This perovskite oxide material possesses a large relative permittivity (ɛr = 1139) and low dielectric loss (tanδ = 0.421) at the ambient atmospheric condition, while the curie temperature arise beyond 450 °C. The resultant dielectric properties of this material assure its promising candidature for feasible applications in smart electronic devices such as dielectric material in ceramic capacitors. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
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