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Background: Averrhoa bilimbi Linn. (Oxalidiaceae) is very popular in folk remedy because the plant has high medicinal value and majority parts of the plant such as leaf, fruit and flower are used to treat fever, mumps, pimple, inflammation, rheumatism, itches, boils, bilious colic, stomach ache, aphthous ulcer, cough, cold, syphilis, hypertension, diabetes etc. However, so far no scientific work has been performed which may support its use in pain. Objective: The present study was undertaken to evaluate possible analgesic actions of methanol extracts of Averrhoa bilimbi Linn. (Oxalidiaceae) leaf, bark and fruits in animal models to support its traditional use for first time. Methods: The crude methanolic extracts of Averrhoa bilimbi Linn. (Oxalidiaceae) leaf, bark and fruits were investigated for the evaluation of analgesic potential in mice. Analgesic activity was assessed by using acetic acid induced writhing method, formaldehyde induced paw licking method and tail immersion method. Results: Methanolic extract (250 and 500 mg/kg) of leaf demonstrated maximum analgesic effect in tail immersion suggesting it to be a centrally acting analgesic. On the other hand leaf extract (250 and 500 mg/kg) reduced acetic acid induced pain significantly (p

This research focuses on studying the Surma Group sediments with an integrated approach of using wireline logs and 2D seismic data from Sylhet structure and outcrop analogy from the Zaflong-Tamabil-Jaintiapur area to explain the geological evolution in the context of sequence stratigraphic framework and its implications to identify the hidden potential of hydrocarbon traps that remains overlooked. The 'SYL-07' well logs divided the encountered sedimentary strata by sequence boundaries (SB) and flooding surfaces (FS) into an upper third-order Lowstand System Tract (3_LST), followed by the third-order Highstand System Tract (3_HST), and underlying third-order Transgressive System Tract (3_TST) which correspond to the Tipam, Boka Bil, and Bhuban formations, respectively. The 3_HST has further been subdivided into fourth-order sequences. Well-to-seismic ties helped in identifying the sequence boundaries in the regional context. Three new prospects in the nose and flank area of the Sylhet structure have been detected based on seismic attributes and log responses. Seismic sweetness attribute anomalies confirmed the existence of these prospects. Rigorous fieldworks provided nineteen facies and seven sets of sedimentary facies associations and helped to establish the sedimentological stacking patterns and corresponding depositional environments. About 2250m lithocolumn constructed from field data revealed four third-order sequence stratigraphic system tracts roughly corresponding to Renji (3_LST), Bhuban (3_TST), Boka Bil (3_HST), and Tipam (3_LST) formations in the bottom-up order, while the obtained facies associations aid in identifying four fourth-order sequences including fourth-order system tracts in the 3_HST. The lithologic column corresponds well with the seismic sections and validates the seismically interpreted third-order system tracts and fourth-order sequences. However, the high-frequency fourth-order system tracts can only be correlated with the log motif patterns due to sub-seismic resolution. The erosional remains of the fourth-order sequences in 3_HST, for instance, the coarsening upward shoreface and shelfal facies topped by transgressive shale, have yielded potential future drilling sites based on seismic attribute and log response analysis. The analogy of field data with well log and seismic data helped the overall evaluation of the hydrocarbon prospectivity of the area. The Dhaka University Journal of Earth and Environmental Sciences, Vol. 11(1), 2022: 95-110

Compact, medium size, white to creamy cauliflower curds were packed into different packaging techniques like i. without packaging (control); ii. packed in low density polyethylene (LDPE) bag with 1% perforation; iii. wrapped with polyethylene (PE) cling film and iv. newspaper (locally used). Half of each treatment was kept at (6±1°C and 50±5% RH) and the other half was kept at ambient conditions (25±3°C and 60±5% RH). LDPE bag or PE cling film has a great effect to retain firmness and reduce weight loss of cauliflower in both storage conditions. Respiration rate, rot incidence and changes of colour values (lightness and hue angle) was reduced significantly for the cauliflowers packed in LDPE bag or wrapped with PE cling film stored in a refrigerator than that of control (without packaging) and all packaging techniques stored at ambient condition throughout the storage period. Initially, acidity, TSS and ascorbic acid content were 0.26%, 4.7° Brix and 58.7 mg 100g-1, respectively. Ascorbic acid content was reduced severely in the cauliflower stored in ambient conditions than that stored in a refrigerator. Cauliflower wrapped with PE cling film and packed in an LDPE bag (1% perforation) stored in a refrigerator (6±1°C and 50±5% RH) could retain white colour, good sensory quality, firm and fresh curds with minimum loss in weight, texture and disease incidence up to 18 days and 16 days, respectively.

Lohakath (Xylia kerrii Craib & Hutch.), a valuable timber species in Bangladesh, belongs to the family Leguminosae. Morphology of fruits, seeds and the effect pre-sowing treatments of seeds were studied. The average length, breath and thickness of fruits were found 13.3, 5.3 and 0.8 cm respectively and those of seeds were 1.4, 0.3 and 0.3 cm respectively. Number of seeds per kilogram was 5000-5400. The germination test was done by sowing the seeds in polybags (4 cm x 6 cm) filled with a mixture of topsoil, coconut husk compost, coarse sand and fine sand in the ratio of 3:4:1:1. The highest germination percentage (98%) was found in scarification with sand paper. The lowest germination percentage (53%) was found in control. About 87% was found in hot water (80 °C) immersion (10 minutes), 84% was found in 80% concentrated H2SO4, 63% was found in immersion in cold water (4 °C) for 12 hours. As the use of sulphuric acid and scarification techniques are somewhat risky and trouble some, therefore, pre-sowing treatment of Lohakath seed for germination in rural Bangladesh could be hot water immersion method.

The adsorption of methylene blue (MB) was investigated using the prepared activated carbon (AC); obtained by the chemical activation of chrome shaving dust (CSD). Results represented that the increase of particle size and impregnation ratio of AC possessed a proportional effect on the adsorption of MB. AC produced by H3PO3, impregnation ratio of 1:6, and mesh size of 40 showed the highest adsorption performance. The removal of other organic and inorganic pollutants from different tannery effluent was found satisfactory like pH, conductivity, turbidity, BOD5, COD, and Cl- values are reduced to 5.5- 8.48, 73-93%, 76-92%, 80-96%, 71-87% and 84-94%, respectively which are nearly closed to the WHO’s standards for industrial effluent to the environment. The microscopic analysis confirmed the smooth and porous surface characteristics of the adsorbent. Hence, CSDAC can be expected to become an effective, low-cost, and suitable adsorbent for both dye and pollutants removal from industrial wastewater. J. Bangladesh Acad. Sci. 46(1); 75-83: June 2022

An epididymal cyst is a scrotal complaint that is usually resolved by surgery. However, multiple post-surgical complications are common, including recurrence, hematoma, abscess, and chronic scrotal swelling. This case study presents homeopathic medicine managing a fairly large-sized epididymal cyst which might encourage physicians to re-think surgical options. A 24 years male presented with pain in the lower pelvic region and swelling in the scrotum; an ultra-sonogram of the scrotum diagnosed a 2.8 cm × 1.9 cm sized epididymal cyst, and Fine Needle Aspiration Cytology (FNAC) confirmed that it was a spermatocele. He was prescribed homeopathic medicine, i.e., Arnica montana, Calcarea fluorica, and Calcarea phosphorica, for his spermatocele. After seven weeks of homeopathic treatment, the cyst size was reduced to 4.8mm×2.2mm. This case study concludes that homeopathic medication resulted in a significant outcome. It also encourages the consideration of homeopathic remedies as an alternative to surgery in treating epididymal cysts.

Students’ academic achievement plays a significant role in the polytechnic institute. It is an important task for the technical student to achieve good results. It becomes more challenging by virtue of the huge amount of data in the polytechnic student databases. Recently, the lack of monitoring of academic activities and their performance has not been harnessed. This is not a good way to evaluate the academic performance of polytechnic students in Bangladesh at present. The study on existing academic prediction systems is still not enough for the polytechnic institutions. Consequently, we have proposed a novel technique to improve student academic performance. In this study, we have used the deep neural network for predicting students' academic final marks. The main objective of this paper is to improve students' results. This paper also explains how the prediction deep neural network model can be used to recognize the most vital attributes in a student's academic data namely midterm_marks, class_ test, attendance, assignment, and target_ marks. By using the proposed model, we can more effectively improve polytechnic student achievement and success.

The carbon nanotubes (CNT) was fabricated on the Si/SiO2/Co substrate by chemical vapor deposition (CVD) method. After that, we dropped variant concentrations of peptide molecules on the CNT surface and measured the SHG intensity from the CNT/PEP interface. We found that the SHG intensity was maximum for all concentrations of peptide molecules at 532 nm when we tuned the wavelength manually by using monochromator. At the fixed SHG wavelength, the intensity was increased with the increase of peptide concentrations. This is because of the availability of the different types of C-bonds may produce chiral structure. This chirality behavior could be the reason for the generation of SHG signal with the increase of peptides concentrations on the CNT surface.

Ba0.985Sr0.015Zr0.10Ti0.90O3 (BSZT) compound is prepared using the standard solid-state reaction technique to explore for energy storage applications. Samples prepared from this compound are sintered at various sintering temperatures (Ts) of 1200, 1250 and 1300 °C, respectively. Influences of Ts on the structural, morphological, dielectric and ferroelectric properties are studied in detail. Rietveld refinement is used on the X-ray diffraction pattern to confirm the crystal structure of the BSZT samples and each sample indicates the tetragonal phase with the P4mm space group. Interestingly, with increasing Ts, the tetragonality increases up to 1250 °C, and then decreases for further increasing Ts, suggesting a transformation to the cubic structure. Morphological analysis of the BSZT samples show that a dense microstructure is attained for higher Ts. Temperature-dependent dielectric studies show that the degree of diffuseness increases up to 1250 °C, and then decreases for further increasing Ts, suggesting a weakening of the relaxor ferroelectric behavior. A non-Debye type relaxation process in the complex impedance and the modulus spectroscopy studies confirm the significant contribution of both the grain and grain boundary to the electrical response of the studied sample. The ferroelectric behaviors of the sample are explored from the polarization versus electric field hysteresis loops. Ferroelectric properties are significantly improved with the Ts.

This report focuses on the investigation of multiferroic properties of 15% Gd and (5–15) % Cr co-doped Bismuth Ferrite (BFO) nanoparticles prepared by sol–gel method. The synthesized pure BFO has shown to be R3c rhombohedral crystal structure which partially transforms to Pnma orthorhombic crystal structure with increasing Cr dopant in co-doped samples. The crystallite size was found to vary from 68 to 22 nm depending on doping level. SEM images exhibited uniform nanoparticles and the average size of particles was shown to vary from 263 to 114 nm which is comparatively higher than that obtained from XRD results due to agglomeration effects. Ferroelectric tests exhibited a significant reduction in polarization in doped BFO under an applied field of ± 15 kV/cm. In contrast, the magnetic measurement showed a substantial improvement in ferromagnetic properties of the synthesized samples compared to un-doped one. A prominent exchange anisotropy effect was also observed in all the samples at room temperature. In addition, co-doped BFO samples demonstrated a significant reduction in band gap energy from 1.88 to 1.68 eV.

Ranitidine is a histamine-2 receptor blocker and it is effective against peptic ulcer, gastroesophageal reflux disease and heart burn. The main objective of this study was to develop and validate an easy, affordable and cost-effective method for the determination of ranitidine in tablet dosage form. The development and validation study was performed under the guidance of ICH and USP. Results showed that the proposed validated method has good accuracy with % RSD of 0.60. Repeatability and intermediate precision suggested good precision whereas the value of correlation coefficient 0.9999 confirmed about the linearity of the method. The system suitability data and similarity factors were also found within the permissible range. The specificity study revealed that there was no placebo and diluent effect on the absorbance. Further, stability study of analytical solutions as well as estimation of drug content from market products were also performed.

In this paper, optical and ferroelectric properties were investigated for gadolinium, $${\hbox {Gd}}^{3+}$$ (5 at.%) and chromium, $${\hbox {Cr}}^{3+}$$ (0–8 at.%) co-doped of BiFeO $$_3$$ . Chemical solution deposition (CSD) method was employed as compatible device fabrication technology to synthesize Gd and Cr co-doped multiferroic $${\hbox {BiFeO}}_{3}$$ $$({\hbox {Bi}}_{0.95}{\hbox {Gd}}_{0.05}{\hbox {Fe}}_{1-x}{\hbox {Cr}}_{x}{\hbox {O}}_{3}$$ with $${\hbox {x}}$$ = 0–0.08). X-ray diffraction (XRD) analysis confirmed a well-defined crystalline phase with a tendency towards structural change from rhombohedral to orthorhombic symmetry. Crystallite size was found to reduce substantially from 34 to 13.5 nm with increasing the doping concentration of $${\hbox {Cr}}^{3+}$$ . The field emission scanning electron microscopy (FESEM) demonstrated a significant reduction in grain size of doped $${\hbox {BiFeO}}_{3}$$ compared to un-doped one following the trend obtained from XRD results. Ferroelectric nature of samples was obtained from polarization versus electric field measurements. Improved ferroelectric order was displayed in co-doped $${\hbox {BiFeO}}_{3}$$ with a maximum remnant polarization of 0.23 μ $${\hbox {C}}/{\hbox {cm}}^2$$ . Diffuse reflectance measurement by UV–Vis–NIR spectroscopy of Gd $$^{3+}$$ and $${\hbox {Cr}}^{3+}$$ co-doped $${\hbox {BiFeO}}_{3}$$ has shown a significant reduction in the optical band-gap energy $$({\hbox {E}}_{g})$$ to 1.71 eV compared to 2.03 eV of pure BiFeO $$_{3}$$ counterpart.

An investigation on Rare earth constituent Ce incorporated BiFeO3–BaTiO3 ceramics has been focused in the present study. The ceramic samples of (Bi0.7Ba0.3)1-xCex(Fe0.7Ti0.3)O3 (x = 0–0.12) were formulated adopting the cost-effective solid-state sintering method. The influence of aliovalent Ce ions on the structural, microstructural, dielectric, ferromagnetic, and optical properties of BiFeO3–BaTiO3 was evaluated in this paper. The coexistence of the Tetragonal and the Rhombohedral phases was established by the Rietveld refinement process. The refined crystallographic parameters showed maximum cell volume (Vcell) and the highest percentage of the Rhombohedral phase for x = 0.06; and consequently, the ceramic exhibited the topmost dielectric constant of 946 at x = 0.06. The scanning electron microscopy of the samples revealed the manifestation of polygonal grain morphology. Besides, remarkably improved ferromagnetic properties were evinced for Ce doped ceramics. The magnitude of saturation (Ms) and remnant (Mr) magnetizations were boosted from 0 emu/g and 0.0019 emu/g to 0.9186 emu/g and 0.3745 emu/g respectively with increasing x from 0 to 0.12. Additionally, the optical band gaps of all the samples were evaluated and found to be in the range of 2.941–3.077 eV.

Multiferroic pure and cobalt-doped bismuth ferrite nanoparticles were synthesized by sol–gel method. The X-ray diffraction study showed a distinct crystalline phase with rhombohedral R3c structure. Rietveld refinement confirmed the reduction of crystallite size from 68 to 45 nm in doped BFO. Transmission electron microscopy was performed to confirm the morphology and lattice constant of the pure and cobalt-doped bismuth ferrite nanoparticles. The results of lattice constant have also been compared with the XRD results. Dielectric properties such as resistance, reactance, impedance, and resistivity were significantly decreased in doped BFO to 7.5 MΩ, 14 MΩ, 17 MΩ, 3.7 MΩ-m, respectively, at 100 Hz with concurrent increased conductivity of 0.184 (S/m) × 10–3 at 10 MHz. The ferroelectric properties of pure and doped samples exhibited significantly enhanced maximum polarization and coercive field in doped BFO of 16 µC/cm2 and 6.2 kV/cm, respectively, at an applied field of 15 kV/cm. Ferromagnetic measurements of synthesized cobalt-doped BFO nanoparticles displayed a substantial improvement in saturation magnetization and coercive force of 7.07 emu/gm and 0.9 kOe, respectively. The important enhancement of magnetic properties with moderate value of coercive field of the cobalt-doped samples may have potential applications in spintronics and memory devices.

Compact, medium size, white to creamy cauliflower curds were packed into different packaging techniques like i. without packaging (control); ii. packed in low density polyethylene (LDPE) bag with 1% perforation; iii. wrapped with polyethylene (PE) cling film and iv. newspaper (locally used). Half of each treatment was kept at (6±1°C and 50±5% RH) and the other half was kept at ambient conditions (25±3°C and 60±5% RH). LDPE bag or PE cling film has a great effect to retain firmness and reduce weight loss of cauliflower in both storage conditions. Respiration rate, rot incidence and changes of colour values (lightness and hue angle) was reduced significantly for the cauliflowers packed in LDPE bag or wrapped with PE cling film stored in a refrigerator than that of control (without packaging) and all packaging techniques stored at ambient condition throughout the storage period. Initially, acidity, TSS and ascorbic acid content were 0.26%, 4.7° Brix and 58.7 mg 100g-1, respectively. Ascorbic acid content was reduced severely in the cauliflower stored in ambient conditions than that stored in a refrigerator. Cauliflower wrapped with PE cling film and packed in an LDPE bag (1% perforation) stored in a refrigerator (6±1°C and 50±5% RH) could retain white colour, good sensory quality, firm and fresh curds with minimum loss in weight, texture and disease incidence up to 18 days and 16 days, respectively.

Pilonidal sinus in the sacrococcygeal region is an acquired condition and usually seen in young male adults. Diagnosis is indicated by to see the site and appearance of chronic discharging opening, and identification of midline pit in the natal cleft. The management of the sacrococcygeal pilonidal sinus varies from clipping of hairs with good hygiene of the area, wide excision of the area with primary or secondary closure and newer flap procedures, but none is widely accepted. The main concern for the treatment to the patient is the recurrence. This prospective study has been performed to determine the effectiveness and safety of the Limberg flap procedure for sacrococcygeal pilonidal sinus for new and recurrent cases. Primary end point was rate of recurrence and secondary end points were its complianceand complications such as wound infection, postoperative pain and return to work. A total of 17 patients were operated from March 2012 to June 2016.Both primary and recurrent diseases were included. All patients successfully underwent surgery. Patients complained very minimal postoperative pain. LO were average 2 days. All patients were discharged with negative suction drain in situ. Drains were removed on 7th POD and stitches were removed on 9th to 12th postoperative day. All patients returned to work after 2nd weeks. In our study no recurrence or major complications were found. Limberg flap for sacrococcygeal pilonidal sinus was found very useful and effective in terms of recurrence rate and patients morbidity. J Shaheed Suhrawardy Med Coll, December 2020, Vol.12(1); 6-8

This paper presents a simple low-cost approach to produce nanoparticles using arc-discharge method. Unlike existing deposition techniques, this is the first instance that nanoparticles are deposited on a charge neutral substrate by arc discharge method. In an atmospheric environment, copper (Cu) has been used as both anode and cathode in the process. The use of same material in both the electrode happens to be the first use case with arc discharge method. A simple airflow has been used to direct the evaporated nanomaterials towards the substrate. XRD, UV and FESEM were employed to confirm the presence of Cu nanoparticles and its properties. XRD pattern shows a crystal size of Cu nanoparticles as 7.4 nm.

Sol–gel as a chemical solution deposition technique is compatible with functional device fabrication technology. Single-phase bismuth ferrite ( $$\hbox {BiFeO}_3$$ ) mutiferroic with its multi-functionality has extensively been studied for a variety of prospective novel device applications. However, the synthesis of $$\hbox {BiFeO}_3$$ is confronted with a challenge to produce pure state without any secondary phase. Scarcity of unified process parameters impede justification of best synthesis techniques. In this work, sol–gel methods with and without auto-combustion reactions were used to synthesize bismuth ferrite ( $$\hbox {BiFeO}_3$$ ) nanoparticles. Different techniques UV–Vis–NIR spectroscopy, XRD, EDS, and SEM were used to investigate the effect of preparation routes on the crystal purity and properties of prepared samples. Synthesized nanoparticles were calcined at temperature between 400 and 800 $$^{\circ }$$ C and an optimal calcination temperature was found to be 600 $$^{\circ }$$ C. Band-gap was determined by UV–Vis–NIR spectroscopy and found to vary from 1.93 to 2.07 eV. X-ray diffraction (XRD) has confirmed single phase rhombohedral crystal structure with R3c symmetry. Avg crystallite size was found to be higher (40–68 nm) in auto-combustion reaction compared to that of 23–42 nm obtained in sol–gel method without auto-combustion reaction. The band-gap energy was found to reduce with decreasing crystallite size (above the critical size of 10 nm) following Brus’s effective mass model. Induced strain was found to exhibit an inverse relation with crystallite size and displayed substantial reduction in auto-combustion reaction route. The microstructural features were investigated by field emission scanning electronic microscopy and avg particle size was shown to vary from 107 to 197 nm depending on adopted synthesis route. A low reaction temperature (70 $$^{\circ }$$ C–80 $$^{\circ }$$ C) without auto-combustion and calcination temperature at $$600^{\circ }$$ C were found to be optimal conditions for the preparation of low impurity un-doped bismuth ferrite nanaoparticles.

Adenoid cystic carcinoma (ACC) is a rare malignant tumor that can manifests as proptosis in adult population. They account for 1.6% of all orbital tumors. Despite their rarity, they are the second most frequent epithelial neoplasms occurring in the lacrimal gland after pleomorphic adenomas. This kind of tumors are commonly occur in the salivary glands but can metastasize to lung, breast ,brain and sinuses in hematogenous route.We describe a patient who presented with protrusion of right eyeball, developing over 8 years with history of intermittent watery discharge for 4 years. His magnetic resonance imaging showed a retrobulbarextraconal soft tissue lesion around the lacrimal fossa with invasion and erosion of the adjacent bone. The patient underwent right sided orbito-pterional craniotomy and gross total removal of tumor. Pathologic analysis showed neoplastic cells in a predominantly cribriform pattern with features of perineural invasion and diagnosed as a case adenoid cystic carcinoma of the lacrimal gland. We review the incidence, clinical features, radiographic and histopathologic features of these rare, aggressive malignancies along with current treatment options with reference to the relevant literatures. Bang. J Neurosurgery 2019; 9(1): 49-53

Bi-metallic silver-copper nanoparticles were synthesized using two modes of combustion synthesis, known as Solution Combustion Synthesis (SCS) and Second Wave Combustion Synthesis (SWCS) to enhance surface alloying in Cu and Ag. The alloying in Ag and Cu nanoparticles was found to affect the adsorption of the oxygen molecule and synergistically increases the relative activity towards ORR and OER in 1 M KOH medium. The catalyst sample AgCu-21, synthesized by the SWCS showed highest activity and stability due to high concentration of Ag-Cu alloy on surface as verified by XPS, TEM and phase mapping of elements on the surface. The ORR catalyzed by AgCu-21 proceed through an overall four-electron pathway with a kinetic current density of 12.4 mA cm?2 at ?0.2 V potential. The XPS analysis of the samples indicates that the ORR and OER activity correlate well with the shifting in binding energy of Ag on Cu surface with higher degree of alloying resulting in better electrocatalytic performance. - 2019 Elsevier B.V. This publication was made possible by NPRP grant ( NPRP8-145-2-066 ) from the Qatar National Research Fund (a member of Qatar Foundation). The statements made herein are solely the responsibility of the author(s). The authors also wish to gratefully acknowledge the Gas Processing Centre (GPC) and Central Laboratory Unit (CLU) at Qatar University, and Qatar Environment and Energy Research Institute (QEERI) at Qatar Foundation for services related to XPS, SEM/TEM and STEM-HAADF-EDS analyses, respectively. Appendix A Scopus

A series of rare earth Y3+ ion substituted Co-Zn ferrites Co0.5Zn0.5YxFe2-xO4 (x = 0.00 to 0.08 in step of 0.02) have been synthesized by conventional double sintering technique from the oxide powders of Co, Zn, Fe, and Y. The XRD, FESEM, EDS, DC resistivity, dielectric measurements, VSM, and Curie temperature (Tc) analysis have been used to investigate structural, morphological, electrical, and magnetic properties. Single phase of cubic spinel structure has been confirmed up to x 0.06. The lattice parameter initially decreases than increases with yttrium concentrations. The FESEM image shows that the grains and grain boundaries are distinct and uniformly distributed and the purity has also been endorsed from the EDS spectra. The average grain size decreases at x = 0.02 and then increases with Y substitution. The long range mobility of charge carriers and presence of localized charge carriers with retreat from the Debye-like behavior in the compositions have been explored using electric modulus and impedance. The magnetic strength diminishes owing to existence of magnetic dilution in the A-B interactions subsequent to the Tc declines with the x contents. The value of saturation magnetization decreases with increasing Y3+ contents that indicates that the domain wall motion become tougher due to substitution of foreign ions Y3+ that possess larger ionic radius. Therefore, the Y3+ substituted Co0.5Zn0.5YxFe2-xO4 (x = 0.00 to 0.08 in step of 0.02) ferrites with high resistivity and low losses has implications to be used in high frequency and power supply devices applications.

Scientific endeavor for tailoring properties of functional materials offers a significant urge to material scientists. The driving force is to facilitate the current understanding that may create new pathway to alternative materials. BiFeO3 is inherently multiferroic and its exploitation for applications in diversified fields are still required extensive investigations in different perspectives. In this context, we synthesized new Bi0.85Gd0.15Fe1−xCrxO3 multiferroics prepared by wet chemical method using high purity metal salts. We mainly focused on the investigation of dielectric properties, ac electrical conductivity and complex electrical modulus of the synthesized materials. Crystallographic measurements confirmed its rhombohedral structure which gradually transforms towards orthorhombic structure with increasing Cr dopants. The grain size of the synthesized samples was found to vary from 68 to 22 nm depending on doping concentration. Dielectric properties of sintered samples were studied in the frequency range of 100 Hz–1 MHz. Frequency dependent dielectric constant has shown to display dielectric dispersion behavior. At higher frequencies (⩾105 Hz), due only to electronic and ionic polarizations the dielectric constant has shown to be independent of frequency. Complex impedance showed a semicircular arc due to the dominant grain boundary resistance and the electric modulus confirms the existence of electrical relaxation. The AC conductivity (σAC) has shown to obey a power law. Obtained improved properties suggested that the synthesized Bi0.85Gd0.15Fe1−xCrxO3 ceramic by partial substitution of A and B sites by Gd3+ and Cr3+ shows added advantage in application over the pure BiFeO3 counterpart. Keywords: Functional ceramic, Dielectric, GB resistance, Polaron hopping, Annealing, Nanoparticles