Dielectric Constant Research Articles

Rainbow trapping based on gradient Kagome topological photonic crystals and one-dimensional arrays

Topological edge states with different frequencies located at different positions are called as the topological rainbow trapping effect. The topological rainbow capture has been studied extensively over the past years. In this work, for the first time to the best of our knowledge, we propose to realize the topological rainbow trapping based on the gradually shrinking and expanding the two-dimensional Kagome lattice. In order to simplify the topological structure, the one-dimensional array instead of the expanding Kagome lattice can also achieve the topological rainbow capture. In addition, the frequencies of rainbow trapping are modulated by the distance from the one-dimensional array to the Kagome lattice. The spatial positions of rainbow trapping at a fixed frequency are very sensitive to the dielectric constants of the environment and of dielectric columns, so we envisage potential applications in the area of topological sensors.

New surface waves in a hyperbolic graded-index crystal

The transverse electric surface waves propagating along the surface of the crystal characterized by a spatial dependence of the dielectric permittivity are theoretically described. A hyperbolic profile of the dielectric permittivity of the crystal is used to obtain an exact analytical solution to the wave equation, which is expressed by Whittaker function. The influence of the parameters of the hyperbolic profile of the dielectric constant on the localization of the electric field near the crystal surface is analyzed. The dependencies of the effective refractive index on the parameters of a hyperbolic profile of the dielectric permittivity are explored. The way to effectively control the localization and intensity of the surface waves by changing the values of the parameters of the hyperbolic profile using the obtained exact solution is found.

Dielectric properties of nanoconfined water.

The dielectric function of a dipolar liquid exhibits a strong wavenumber dependence in the bulk homogeneous state. Such a behavior seems to suggest the possibility of a strong system size dependence of the dielectric constant (DC) of a nanoconfined liquid, although details have been revealed only recently. The dielectric properties of nanoconfined water, indeed, show a marked sensitivity not only to the size and shape (dielectric boundaries) of confinement but also to the nature of surface-water interactions. For geometries widely studied, namely, water confined in a narrow slit, nanocylinder, and nanospherical cavity, the asymptotic approach to the bulk value of the DC with the increase in confinement size is found to be surprisingly slow. This seems to imply the appearance of a dipolar cross correlation length, much larger than the molecular length-scale of water. In narrow slits and narrow cylinders, the dielectric function becomes both inhomogeneous and anisotropic, and the longitudinal and transverse components display markedly different system size dependencies. This sensitivity can be traced back to the dependence of the DC on the ratio of the mean square dipole moment fluctuation to the volume of the system. The observed sensitivity of collective dipole moment fluctuations to the length scale of confinement points to the possibility of using DC to estimate the orientational correlation length scale, which has been an elusive quantity. Furthermore, the determination of volume also requires special consideration when the system size is in nanoscale. We discuss these and several other interesting issues along with several applications that have emerged in recent years.

Structural, morphological and dielectric properties of Ni-doped ZnO nanoceramics prepared by Sol-gel method

Abstract The objective of this work is to synthesize new set of nanoceramics that improves structural integrity and dielectric performance while maintaining the desired characteristics of ZnO with the introduction of regulated Ni-doping. By using the sol-gel process, Ni-doped ZnO nanoceramics were successfully synthesized. Zn1–xNixO (x = 0, 0.05, 0.01, 0.15) wt % of Ni in to Zn precursor salts were added. Doping levels are considered to be low to moderate level, which typically lead to considerable changes in structural, optical, morphological and dielectric properties without modification of the nature of host ZnO. Higher concentrations greater than 15 % can result in the precipitation of isolated Ni or NiO phases which may negatively influence uniformity and consistency of the doped material. By using XRD for structural study, phase purity and the hexagonal wurtzite structure were confirmed. The integration of Ni2+ ions into the ZnO lattice is indicated by the change in lattice parameters and bond length for the Ni-doped ZnO sample. Samples follow almost same c/a ratio of an average of 1.601. An increase in “Ni” content results a decrease in crystallite size. Average crystallite size has been calculated ranging from 43.88 nm to 17.01 nm for ZnO to Zn0.85Ni0.15O samples. According to SEM analysis, the grains of the samples are uniformly dispersed. When the produced NPs were examined for purity using EDAX analysis, it was found that the beginning stoichiometries and the chemical composition of Zn, Ni, and O agreed well. The development of the ZnO phase was verified by the presence of a peak at 523 cm−1 in the FTIR spectra. According to the findings of X-ray photoelectron spectroscopy (XPS), Ni was observed to be present in the ZnO lattice in the form of Ni2+.The Koops phenomenological theory and the Maxwell-Wagner model provide an explanation for the observed dielectric behaviour. It is noted that for pure ZnO, the dielectric constant and dielectric loss have maximum values, whereas for doped samples, these values decreases. Our sample is suitable for high frequency device application due to a negligible dielectric loss of 0.047 at 15 % Ni concentration in the high-frequency region. Ni-doping affects AC conductivity. At 10 MHz, Zn0.9Ni0.1O has the highest AC conductivity (2.654 × 10⁻⁴ (Ω cm)⁻1), while Zn0.85Ni0.15O shows a lower value (1.048 × 10⁻⁴ (Ω cm)⁻1), indicating a balance between doping level and grain boundary influence on conduction. The impedance study reveals that just one semicircle in all samples, indicating that the influence of grain boundaries is more significant than the contribution of individual grains.

Study on the improvement of the insulation performance of polypropylene film by regulating TiO2-F by liquid phase grafting

Abstract According to the problem that the performance of film capacitors is limited due to the poor insulation of polypropylene film, a new nano-filler was studied and a polypropylene composite dielectric was fabricated. The breakdown strength of composite dielectrics was measured and the mechanism for improving their insulation properties was analyzed. In this paper, TiO2 with high dielectric constant is plasma-treated and then coated with a layer of polypropylene shell. TiO2 increases the dielectric constant of polypropylene film composite dielectrics, and shell-like polypropylene makes TiO2 more tightly bound to the polypropylene matrix. Compared with pure PP, the breakdown voltage of TiO2-F is increased by 18.7%, and the breakdown voltage of TiO2-F@PP-mah is increased by 40.5%, and the new nano filler greatly improves the insulation performance of PP. The experimental results show that TiO2 introduces a low-density trap, TiO2-F introduces a high-density deep trap, and the modification of PP-mah slows down the dielectric constant conflict, increases the compatibility between the nanoparticles and the matrix, and increases the trap energy level. Based on the analysis of experimental results with different mass fractions, this paper proposes the optimal filling ratio of the new core-shell, which provides a new method for the composite dielectric to improve the insulation performance.

Evolution of Interfacial Hydration Structure Induced by Ion Condensation and Correlation Effects

Interfacial hydration structures are crucial in wide‐ranging applications, including battery, colloid, lubrication. Multivalent ions like Mg2+ and La3+ show irreplaceable roles in these applications, which are hypothesized due to their unique interfacial hydration structures. However, this hypothesis lacks experimental supports. Here, we provide the first observation for their interfacial hydration structures with molecular resolution using atomic force microscopy. We observed the evolution of layered hydration structures at La(NO3)3 solution‐mica interfaces. As concentration increases from 25 mM to 2 M, the layer number varies from 2 to 1 and back to 2, and the interlayer thickness rises from 0.25±0.05 to 0.34±0.03 nm, with hydration force increasing from 0.27±0.07 to 1.04±0.24 nN. Theory and molecular simulation reveal that the cations form inner‐sphere complexes. Multivalence induces concentration‐dependent ion condensation and correlation effects, resulting in compositional and structural evolution within interfacial hydration structures. Additional experiments at seven different solid‐liquid interfaces together with literature comparison confirm the universality of this mechanism for both multivalent and monovalent ions. New factors affecting interfacial hydration structures are revealed, including concentration and solvent dielectric constant. This insight provides guidance for designing interfacial hydration structures to optimize solid‐liquid‐interphase for battery life extension, modulate colloid stability and develop efficient lubricants.

Intrinsic Defects in α-Al2O3: Structural and Electronic Properties

Abstract Due to their high dielectric constants and wide bandgap, Al2O3 has become popular in semiconductor applications, but with high-density interface defect structures. Understanding the structural distortions of intrinsic defects and their impact on electronic properties, is of particular importance for the applications. Herein, we study the impacts of four intrinsic defects on the structural and electronic properties of α-Al2O3 using first-principles calculations. The four intrinsic defects cause structural distortions at their respective defect sites and defect states within the band gap, with Oi inducing the most significant distortions and exhibiting the most complex defect states accordingly. When the Fermi level is 3.05 eV under O-poor conditions, VO is the most favorable defects based on the formation energy calculations. Additionally, the intrinsic defects in α-Al2O3 can effectively modulate band edges, and thus modify the leakage currents. In summary, our results provide significant theoretical insights for α-Al2O3-based semiconductor applications.

Evolution of Interfacial Hydration Structure Induced by Ion Condensation and Correlation Effects.

Interfacial hydration structures are crucial in wide-ranging applications, including battery, colloid, lubrication. Multivalent ions like Mg2+ and La3+ show irreplaceable roles in these applications, which are hypothesized due to their unique interfacial hydration structures. However, this hypothesis lacks experimental supports. Here, we provide the first observation for their interfacial hydration structures with molecular resolution using atomic force microscopy. We observed the evolution of layered hydration structures at La(NO3)3 solution-mica interfaces. As concentration increases from 25 mM to 2 M, the layer number varies from 2 to 1 and back to 2, and the interlayer thickness rises from 0.25±0.05 to 0.34±0.03 nm, with hydration force increasing from 0.27±0.07 to 1.04±0.24 nN. Theory and molecular simulation reveal that the cations form inner-sphere complexes. Multivalence induces concentration-dependent ion condensation and correlation effects, resulting in compositional and structural evolution within interfacial hydration structures. Additional experiments at seven different solid-liquid interfaces together with literature comparison confirm the universality of this mechanism for both multivalent and monovalent ions. New factors affecting interfacial hydration structures are revealed, including concentration and solvent dielectric constant. This insight provides guidance for designing interfacial hydration structures to optimize solid-liquid-interphase for battery life extension, modulate colloid stability and develop efficient lubricants.

Enhanced electrical reliability of Zr‐doped BaTiO3 nanoceramics: First‐principle calculations and experimental studies

AbstractWith the miniaturization of multilayer ceramic capacitors (MLCCs) and the increase of electric field on single‐layer dielectrics, it is essential for the development of nanograin high‐reliability dielectric materials. In this work, Zr‐doped BaTiO3‐based ceramics with an average grain size of 130–150 nm were prepared by a chemical coating method. The effects and intrinsic mechanisms of Zr concentration on microstructure, dielectric properties, and reliability were systematically investigated by theoretical calculations and experiments. Zr additives lower the migration barrier of the dopants, which consequently contributes to the formation of thick shell layers in the core‐shell structure and grain growth, affecting the temperature stability and DC bias characteristics of the dielectric constant. Owing to the large change rate of the Zr–O bond length, the introduction of Zr increases the migration barrier of oxygen vacancies. However, the decrease in the effective doping concentration of the shell part and the reduction in the number of grain boundaries of ceramics with high Zr content have a weakening effect on the inhibition of oxygen vacancy migration. An appropriate amount of Zr doping can adjust the dielectric properties and improve the reliability of BaTiO3‐based ceramics. This study provides a theoretical reference for the design of high‐quality MLCCs.

High-temperature high-k polyolefin by rational molecular design

Polymer film dielectrics are highly favored for capacitive energy storage due to the inherent advantages of high breakdown strength, low dielectric loss, and ease of processing. High-density renewables conversion and harsh-condition electrification further emphasize the need for high-temperature, high-k polymers. A unique design strategy is developed to augment high-temperature polyolefins with improved dielectric constant, via the integration of phenyl pendants hanging off the rigid bicyclic backbone. The impacts of the pendant polarizability and steric positioning on dielectric constant, bandgap, glass-transition temperature (Tg), and high-field, high-temperature dielectric characteristics have been investigated. The orientational polarization of the polar phenyl pendants with rotational degree of freedom imparts cyclic olefins with enhanced dielectric constants, while maintaining the large bandgap, and high glass-transition temperature (Tg > 170 °C). Among these synthesized polymers, m-PNB-BP stands out with a remarkable dielectric constant of 4 at a high sub-Tg temperature of 150 °C, and a high discharged density of 8.6 J/m3 at 660 MV/m. This study unveils a different path for designing high-temperature polymers with enhanced dielectric constants, particularly beneficial for capacitive energy storage.

Constructing Predictive Implicit Solvent Models: Insights from Exploring Potential Parameter Space and Property Predictions.

Implicit solvent (IS) models enhance the efficiency of simulating liquid systems, but those based on the potential of mean force calculations using explicit solvent (ES) models often fail to capture the solute structure and assembly dynamics under various conditions. This study examines the relationships between the parameter space of IS models and their predictive capabilities regarding solute structure and assembly dynamics, focusing on NaCl solutions and protein-bound silica colloidal nanoparticles. For NaCl solutions, models developed using concentration-dependent dielectric constants generally lack efficacy, and their effectiveness in predicting high-concentration liquid structures varies based on the ES model used. Adjusting the dielectric constant value or the shape of the short-range potentials can improve the accuracy of these models in predicting liquid structures. For protein-bound silica colloidal nanoparticles, we find that interaction site size and model resolution significantly influence the prediction of nanoparticle assembly dynamics, with different resolutions producing aggregates with distinct structures and connection modes. This study elucidates the complex relationship between parameter space in IS models and liquid structure and assembly kinetics, providing crucial insights for developing more accurate and predictive models.

Silane‐treated kapok fiber/epoxy composites for aerospace cabin interiors: Synthesis and characterization

AbstractThis study underscores the potential of silanized kapok fiber (KF) as a lightweight, eco‐friendly reinforcement for aerospace cabin interiors, emphasizing electrical insulation and mechanical resilience. KF/epoxy composites were fabricated via hand lay‐up, and silane treatment improved flexural, tensile, impact, and storage modulus by 131%, 101%, 145%, and 105%, respectively, due to enhanced fiber‐matrix interaction. Dielectric and impedance spectroscopy revealed reduced dielectric constant, loss, and AC conductivity due to the removal of polar groups and compact composite structure. Additionally, 9% silane concentration decreased water absorption by 3.9% over 400 h due to the tight packing and binding between the fiber and epoxy. These findings demonstrate that silane treatment enhances fiber‐matrix compatibility, improving the mechanical and overall performance of KF/epoxy composites.Highlights KFs are treated with silane coupling agents. Silane treatment enhanced interfacial, chemical and mechanical bonding. Mechanical and electrical properties of composites enhanced with silane grafting on KF. Tg of the composites increased after silane treatment. Explored density and demonstrated reduced water absorption properties of the composites.

Sandwich-Structured Fluorinated Polyimide Aerogel/Paraffin Phase-Change Composites Simultaneously Enables Gradient Thermal Protection and Electromagnetic Wave Transmission.

There is an emerging requirement of advanced functional materials for simultaneous thermal protection and electromagnetic wave-transparent transmission applications. A novel polyimide (PI) aerogel-based sandwich-structural composite is developed to meet such a requirement in this study. This composite is based on a unidirectional fluorinated PI (FPI) aerogel as a lower layer, a nondirectional conventional PI aerogel as a middle layer, and a nondirectional FPI aerogel/paraffin phase-change composite as an upper layer. The lower layer exhibits a unique unidirectional porous microstructure and an ultralow dielectric constant of 1.04. The upper layer possesses a dynamical temperature regulation capability thanks to its loaded paraffin having a high latent heat capacity of 242.7Jg-1. The presence of the nondirectional PI aerogel middle layer can effectively prevent against the leakage of paraffin from the upper layer to the surface of the composite. Through a rational integration of three functional layers, the developed sandwich-structured composite not only can provide gradient thermal protection for hot objects over a long period but also exhibits an excellent wave-transparent capability to establish communication between two electromagnetically shielded electronic devices. With such prominent thermal insulation and wave-transparent functions, the sandwich-structured composite exhibits great potential for specific applications in aircraft, spacecraft, radar systems, and satellite communication.

First-principles investigation of structural, mechanical, and electronic properties of AMgX3 (A=Ga, In, Tl, and X=Cl, Br, I) perovskites for optoelectronic applications

Abstract Metal-halide perovskites have emerged as a revolutionary material in solar energy technology, offering exceptional light-harvesting efficiency, eco-friendly characteristics, and low production costs. These materials are paving the way for next-generation photovoltaic devices with their outstanding optoelectronic properties and scalability for commercial applications. To determine the various features of the halide perovskites AMgX3 (where A stands for Ga, In, Tl, and X for Cl, Br, and I), we utilized DFT with the (Generalized Gradient Approximation) GGA-PBE (Perdew–Burke–Ernzerhof) exchange and correlation approximation to examine the structural, mechanical, electronic, and optical behaviors of the perovskite materials. Structurally, these materials exhibit cubic stability, vital for high-performance durability in photovoltaic devices. Mechanically, the calculated elastic constants verify their strength, suitable for environments where mechanical stability is critical, such as in aerospace electronics. The band gap range (1.22–3.69 eV) shows how versatile the materials are. TlMgI3 is suitable for infrared (IR) detection, whereas GaMgCl3 and InMgCl3 are optimal for ultraviolet (UV) applications. These findings support applications from IR sensors to UV photo detectors. The compounds’ optical properties, such as their high absorption coefficients, dielectric constants, and reflectivity, show how well they can collect and send light, which is important for solar cells and LEDs. The mechanical and optoelectronic properties collectively enhance their suitability for photonic and thermoelectric devices, offering scalable solutions for renewable energy and advanced photonics applications.

High performance AlGaN/GaN MISHEMTs using N2O treated TiO2 as the gate dielectric

Abstract In this work, TiO2 thin films deposited by the atomic layer deposition (ALD) method were treated with a special N2O plasma surface treatment and used as the gate dielectric for AlGaN/GaN metal insulator semiconductor high electron mobility transistors (MISHEMTs). The N2O plasma surface treatment effectively reduces defects in the oxide during low-temperature ALD growth. In addition, it allows oxygen atoms to diffuse into the device cap layer to increase the barrier height and thus reduce the gate leakage current. These TiO2 films exhibit a dielectric constant of 54.8 and a two-terminal current of 1.96 × 10−10 A mm−1 in 2 μm distance. When applied as the gate dielectric, the AlGaN/GaN MISHEMT with a 2 μm-gate-length shows a high on/off ratio of 2.59 × 108 and a low subthreshold slope (SS) of 84 mV dec−1 among all GaN MISHEMTs using TiO2 as the gate dielectric. This work provides a feasible way to significantly improve the TiO2 film electrical property for gate dielectrics, and it suggests that the developed TiO2 dielectric is a promising high-κ gate oxide and a potential passivation layer for GaN-based MISHEMTs, which can be further extended to other transistors.

Approach to optimize poling conditions of metal matrix piezoelectric composite

An approach for optimizing the poling conditions of metal matrix piezoelectric composite (MMPC) using a series capacitor model is proposed and its verification is performed. The oxide film formed around the electrodes in MMPC is necessary for insulation between the electrodes and the metal matrix, however, during the poling process, the oxide film deprives the polarizing electric field and prevents polarization of piezoelectric ceramics. Therefore, a method to optimize the polarizing voltage using the thickness and dielectric constant of the oxide film in a series capacitor model with a simplified structure of the MMPC is required. In addition, the validity of the proposed method is investigated by output voltage obtained from fabricated composites that performed the poling process. The results of the optimization show that optimal polarization is not possible with the Ni and Ti oxide films used in this study. However, the results of the polarization treatment of the actual composite material confirmed the validity of the proposed method, as the output voltage improvement is in line with the proposed method.

Linear and Nonlinear Optical Characteristics of Basic Fuchsin-Doped Polyvinyl Alcohol Films for Flexible Optoelectronics

Abstract Polyvinyl alcohol (PVA) containing different levels of basic fuchsine (BF) was prepared using the solution casting method. Characterization via Fourier-transform infrared spectroscopy detailed changes in functional groups within the PVA/BF composites, indicates the hydrogen bonding between OH group of PVA and BF molecules. Optical investigations spanning the 190-2500 nm range demonstrated UV blocking properties in prepared PVA/BF composites (fromn 2.05 to 2.56 eV and from 4.08 to 6.32 eV). Moreover, the studies on optical band gap indicated a decrease with increased BF concentrations, reflecting altered electronic transitions within the prepared composites. The study also employed the single oscillator model provided by Wemple-DiDomenico to elucidate refractive index variations. After incorporating BF dye into the PVA polymer, the values of the dielectric constant as the frequency approaches infinity (ε∞), the dielectric constant of lattice (εL), dispersion energy (Ed), and oscillator energy (Eo) in PVA/BF composite samples showed an increase. Moreover, the nonlinear optical properties, including optical susceptibility and nonlinear refractive index were investigated and discussed. These findings underscore the versatility of PVA doped with BF for various applications including optical filters, and solar cell devices.

Assessment of water diffusion in epoxy composites: a novel approach towards holistic understanding

Performance of insulating polymers is seriously impacted by water absorption. Hence, its assessment using Fick’s law and 3-core water shell model are used for a holistic understanding of water diffusion. Epoxy with organically modified montmorillonite clay of 2, 5 and 7 weight percent (wt.%) are fabricated and water diffusion is carried out for 240 hours. The results are analysed by dielectric and gravimetric approaches. The weight gain in epoxy after 240 hours is 0.42% and 0.19% at 5 wt.% of the filler. The weight gain peaks after 120 hours in all the composites and the variations from 120 to 240 hours are minimal. The weight gain rate is lowest at 96 hours, and it peaks at 120 hours and is highest at 0.00033%/hour in epoxy, and reduces to 0.0023%/hour with filler of 7 wt.%. The weight gain and weight gain rate are characteristics of the epoxy and the filler controls the magnitude. Diffusion coefficient is lowest at 5 wt.% but the differences in the other composites are limited. The effect of fillers on free volume, free volume rate and fractional free volume are correlated to the dielectric parameters. Water uptake increases the DC conductivity from 10−14 to 10−12 S/m after 240 hours and the relative permittivity increases by 40%. The water shell model, diffusion parameters and the free volume parameters are correlated to the results of DC conductivity and relative permittivity. Subtle changes induced by absorbed water is identified by the method adopted.

Enhanced dielectric and ferroelectric properties near the morphotropic phase boundary in BNBT-BSN ceramics prepared by the solid-state combustion technique

The effect of firing temperatures on the phase structure, microstructure, and electrical properties of 0.99Bi0.47Na0.47Ba0.06TiO3-0.01BaSn0.70Nb0.24O3 (abbreviated as BNBT-BSN) lead-free ceramics fabricated by the solid-state combustion technique, with glycine used as the fuel, were investigated. All BNBT-BSN samples were calcined at temperatures ranging from 750 to 850 °C for 1 to 4 h and sintered at temperatures from 1100 to 1200 °C for 2 h. A pure perovskite structure was obtained after calcination at 800 °C for 2 h. The X-ray diffraction (XRD) patterns showed the coexistence of rhombohedral and tetragonal phases in all ceramics. The average grain size tended to increase with rising sintering temperatures. The optimal condition for fabricating BNBT-BSN ceramics with a morphotropic phase boundary (MPB) was observed at a sintering temperature of 1175 °C for 2 h, where the material exhibited the highest measured density (5.50 g/cm3), maximum dielectric constant at Tm (ɛm = 6513), maximum polarization (Pmax = 42.21 µC/cm2), the largest bulk resistivity (ρ = 1.70 × 104) and the highest activation energy of conduction (Ea = 1.52 eV). These features suggest that this ceramic is a suitable material for applications in actuators, transducers, and high-performance capacitors.

Investigation of structural, magnetic, and dielectric properties of BaFe12O19/Pr1−xSrxCoyMn1−yO3 composites; an emerging aspirant for high frequency applications

Abstract In this work, barium hexaferrite/perovskite BaFe12O19/Pr1-xSrxCoyMn1-yO3 composite ferrites were synthesized using single step sol–gel auto-combustion method. The lattice parameters and stabilized structural phases were studied using x-ray diffraction (XRD). The average crystallite size was found in the range of 51.6 nm–71.7 nm. Field Emission Scanning Electron Microscopy (FE-SEM) micrographs showed agglomerated particles having hexagonal as well as platelets like spherical shapes. Magnetic measurements done using vibrating sample magnetometer revealed that composite S3 (BaFe12O19/Pr0.75Sr0.25Co0.25Mn0.75O3) exhibits low saturation magnetization (35.3 emu g−1), and coercivity (775 Oe). Dielectric analysis revealed that, at 1 MHz frequency, the tangent loss (1.3) and dielectric loss (22.5) are highest for the composite S3 (BaFe12O19/Pr0.75Sr0.25Co0.25Mn0.75O3), whereas largest dielectric constant (20.7) was exhibited by S4 (BaFe12O19/Pr0.5Sr0.5Co0.5Mn0.5O3). Similarly, composite S2 (BaFe12O19/PrMnO3) (having the highest quality factor of 4.05) exhibited the largest resistivity (18885.8 Ω-cm), while composite S3 (BaFe12O19/Pr0.75Sr0.25Co0.25Mn0.75O3) showed highest AC conductivity (0.00125 (Ω-cm)−1). The investigated composites are found excellent choice for designing devices for applications involving high-frequency interference and electromagnetic shielding due to their unique magnetic and dielectric properties.