Dielectric Loss Tangent Tanδ Research Articles

Comparison of diagnostic methods for thermal aging of shipboard cable

This paper proposes a comparison of two methods for diagnosing the insulation condition of ship power cables that are subject to accelerated aging at elevated temperatures. Earlier, an express methodology was presented for checking ship cables by measuring the hardness of insulation of conductors and the hose sheath with a device according to the Shore method, which makes it possible to estimate the service life of cable routes without dismantling them. The methodology was tested on fishing vessels and was taken into account by the Russian Maritime Register of Shipping. However, any applied diagnostic methods are not without faults due to interference and errors, and therefore cannot provide a reliable control result. To increase the reliability of the audit of various electrical equipment and ship cables, it is advisable to control other parameters characterizing the technical condition of the facility. One of these parameters is the dielectric loss tangent (tanδ), which can be measured with the Tangens 2000 instrument. The article presents the results of measuring the insulation hardness and loss tangent during thermal aging of a ship cable KNRE 2x1, and a comparison of two methods for assessing the condition and service life of a cable.

Electrical and dielectric properties study of CaZrO3-CaTiO3 composite system by impedance spectroscopy

CaZrO3 mono-phase and (1-x)CaZrO3-xCaTiO3 composite systems, where x = 0.2, 0.25, and 0.3, were synthesized by a conventional solid-state method. XRD patterns of the synthesized composites reveal the formation of both phases, and no secondary phase was detected. The analysis of the internal stress in the composites systems by the William-Hall equation indicates that tensile stress is applied to the CaZrO3 grains, while compressive stress is applied to CaTiO3 grains. TEM analyses show that the CaTiO3 grain is surrounded by CaZrO3 grains, confirming the presence of the CaZrO3/CaTiO3 hetero-interfaces and confirming the results obtained by the William-Hall equation. Impedance spectra were well modelled by introducing electrical equivalent circuits. The obtained results show that the incorporation of the CaTiO3 phase favors the ionic conductivity in the composite and that the 0.75CaZrO3-0.25CaTiO3 composite exhibits the highest oxide ion conductivity among all the samples, where its total conductivity value is about 1.23 × 10−4 s cm−1 at 500 °C, which is higher than that of the CZO mono-phase (1.01 × 10−6 s cm−1 at 500 °C), and than that of the CTO mono-phase (2.1 × 10−7s cm−1 at 500 °C). The conductivity enhancement was explained based on the variation of the hetero-interface CaZrO3/CaTiO3 surface area. Furthermore, the frequency and temperature dependence of dielectric constant ( $$ {\varepsilon}_r^{\prime } $$ ) and dielectric loss tangent (tanδ) were investigated in detail and the dielectric response improvement was attributed to the improvement of the space charge polarization in the hetero-interfaces.

Structural Characteristics, Optical, Transport and Magnetic Properties of Zinc Doped Cobalt Chromium Ferrite Prepared by Co-precipitation Method

A series of zinc doped cobalt chromium ferrite Co1-xZnxFe1.5Cr0.5O4 (where 0 £ x £ 1) were synthesized by co-precipitation technique. Structural, optical, transport and magnetic properties were characterized by X-ray diffraction (XRD), diffuse reflectance, AC electrical properties and hysteresis loop. XRD analysis indicates that all samples consist of a single-phase cubic spinel structure. Rietveld refinement results indicated an increase in lattice parameter due to the replacement of Co2+ by Zn2+ and migration of Fe3+ ions from A-site to B-site. Optical energy band gaps were calculated and it was found that both Eg1 and Eg2 increase with increasing Zn content. Dielectric constant έ, έ', and dielectric loss tangent tanδ were measured at room temperature as a function of applied frequency and temperature. It was noticed, that έ and έ' increase with temperature increment and decrease with increasing frequency and this anomaly can be explained by Maxwell Wagner two-layer model. Magnetic measurements revealed that the saturation magnetization increases as Zn content increases up to Zn=0.4 and after that, the saturation magnetization decreases.

Radiation response of zirconium silicate P-MOS capacitor

The chemical bonding of zirconium silicate films were examined by FTIR. The capacitance-voltage (C-V) measurements before and after irradiation were performed at high frequency. Furthermore, significant changes were observed depending on the radiation dose of the oxide traps and the intensity of the interface state. The sensitivity of this MOS capacitor is 4.3, 31.3 and 15.6 times less sensitive compared to the same thickness as Sm2O3, Al2O3 and Gd2O3. Therefore, it can be used as radiation-resistant material in nuclear reactors and space applications due to its stable electrical characteristics compared to other defined dielectrics. Interface states, (Nit) Barrier potential (Φb) and oxide traps (Not) have also been investigated depending on the radiation effects. Φb is one of these important electrical properties. Φb values decreased with increasing in radiation dose. Besides, radiation and frequency dependent dielectric constant (ε′), dielectric loss (ε″) and dielectric loss tangent (tanδ) and conductivity (σac) of zirconium silicate were investigated. It is concluded that high-k zirconium Silicate is suitable for electronics applications in radiation harsh environment.

Effects of Adding Transition Metal-Substituted Polyoxotungstates on the Frequency and Temperature-Dependent Dielectric Properties of (Bi1.8Pb0.4)Sr2Ca2Cu3O10+δ Superconducting Phase

In the search for highly responsive dielectric materials, superconducting samples of type (Bi,Pb)-2223 were prepared using the standard solid-state reaction technique, with the addition of three different concentrations of ferrato and mangano-undecatungstosilicate (0.04, 0.12, and 0.20 wt%). The dielectric studies were performed by measuring the parallel capacitance $$C_{p}$$ as well as the dielectric loss factor using LCR HiTESTER. The studies were performed at temperature and frequency ranges starting from room temperature down to 98 K and from 50 kHz up to 5 MHz, respectively. The dielectric behavior was investigated by calculating both dielectric constants ( $$\varepsilon^{\prime}$$ and $$\varepsilon^{\prime\prime}$$ ), loss tangent (Tanδ) and ac conductivity (σac) as a function of frequency, temperature and addition concentrations of the {FeSiW11} and {MnSiW11} polyoxometalates. The results revealed that the dielectric parameters decrease with increasing frequency at each temperature for all the {FeSiW11}x(Bi,Pb)-2223 and {MnSiW11}x(Bi,Pb)-2223 prepared samples. Moreover, $$\varepsilon^{\prime}$$ and σac showed a decreasing trend with an increase in temperature in contrast to the increasing trend shown by $$\varepsilon^{\prime\prime}$$ and Tanδ. Additionally, $$\varepsilon^{\prime\prime}$$ has decreased upon increasing temperature at low frequencies. Accordingly, low {MnSiW11} addition at 0.12 wt% exhibited the highest dielectric constant $$\left( {1.99 \times 10^{7} } \right)$$ and ac conductivity $$61.449$$ (Ω.m)−1 with minimum dissipation (1.078). Furthermore, the ac conductivity was studied according to the power law, and the frequency exponent was found greater than one $$\left( {1.654 \le S \le 1.759} \right)$$ for all the prepared samples.

A rapid microwave synthesis of Ag2S nanoparticles and their photocatalytic performance under UV and visible light illumination for water treatment applications

In current work, silver sulfide nanoparticles (Ag2S NPs) were prepared in presence of 0.0, 0.1, 0.25.0.5 and 1.0 g of sodium dodecyl sulfate surfactant (named as S1, S2, S3, S4 and S5) though a microwave assisted route within 10 min of irradiation at 700 W power. XRD established decent crystalline nature of the prepared Ag2S NPs of crystallite size in range from 44 to 49 nm. Scanning electron microscopy showed that the synthesized particles have three-dimensional irregular shape, very close to fused-spheres or worm-like structure. More importantly; the size of the particles is decreased with the amount of the applied SDS surfactant. Kubelka-Munk relation was used to evaluate energy gap and noticed ~1.014 for S1, 1.017 eV for S2, 1.021 eV for S3, 1.023 eV for S4, and 1.026 eV for S5 samples, i.e. the energy gap is slightly increase with the amount of the applied SDS surfactant. The estimated refractive index values are noted in 1.51–2.2 range. Dielectric constant (ε1), loss tangent (tanδ) and dielectric loss (ε2) were calculated and shows high values of ε1 and low values of tanδ. The photocatalytic performance was examined in methyl green dye photocatalytic decolourization under illumination of UV/visible light. Ag2S samples exhibited excellent photocatalytic behavior, hence can be used in water treatment applications.

AC Conduction Mechanism in (Cu)x/(CuTl)-1223 Nanoparticles–Superconductor Composites

Copper (Cu) nanoparticles (NPs) were prepared by sol–gel process, and superconducting (Cu0.5Tl0.5)Ba2Ca2Cu3O10−δ {(CuTl)-1223} phase was synthesized by conventional solid-state reaction. The desired (Cu)x/(CuTl)-1223, x = 0–4.0 wt% composites, were obtained by adding Cu NPs in superconducting (CuTl)-1223 phase. These composites were characterized by X-ray diffraction, DC-resistivity versus temperature (R–T) and AC conduction measurements. The tetragonal crystal structure with P4/mmm space group of the host superconducting (CuTl)-1223 phase remained dominant after the addition of Cu NPs. The zero-resistivity critical temperature Tc(0) (K) was increased, and normal state resistivity was decreased after addition of Cu NPs in CuTl-1223 phase. The frequency- and temperature-dependent AC conduction properties of (Cu)x/(CuTl)-1223 composites were explored via dielectric, impedance and electric modulus measurements. The dielectric constant (ɛr/, ɛr//) and loss tangent (tanδ) were suppressed, while AC conductivity (σac) was improved with the addition of Cu NPs in (CuTl)-1223 phase. Comparatively, the capacitance associated with grain boundaries regions was found to be greater than the capacitance associated with grain regions. The capacitive behavior of the grain boundaries was decreased, while that of the grains was increased with increasing operating temperature for all these composite samples. The shifting of peaks in imaginary part of the electric modulus (M//) versus frequency (f) spectra toward lower frequency regime with increasing Cu NPs contents in superconducting (CuTl)-1223 phase is witnessed for the existence of non-Debye relaxation in the material.

Fabrication and characterization of dielectric ceramics using alumina and aluminosilicates

Abstract The aim was to study formulations containing aluminosilicate and alumina in order to obtain compositions with suitable properties to fabricate dielectric ceramic devices. Initially, the precursors were subjected to chemical, mineralogical and granulometric characterization. The formulations were defined and specimens were pressed (19.6 MPa) in shapes of disc and rectangular bar. Specimens were dried, heat-treated at 1400, 1450 and 1500 °C and the mineralogical, morphological, physical, dielectric and mechanical properties were evaluated. The relative dielectric constant (εr) and loss tangent (tanδ) were evaluated at 0.1, 1, 10 and 100 kHz at room temperature. The mullite was the major phase for the studied temperature range. Compositions with a higher content of fluxes showed lower porosity and better dielectric properties and flexural strength. Values of εr at 1 kHz (~3.5 to 4.5) were close to that of the mullite for the samples fired at 1400 °C.

Investigation of dielectric properties of Ag-doped ZnO thin films

In this study, undoped and Ag-doped ZnO thin films were grown on p-type Si substrates using Sol-Gel spin coating technique at room temperature. Optical properties, such as refractive index (n) and extinction coefficient (k) were determined using the optical data in terms of wavelength and photon energy, respectively. Depending on Ag doping concentration, some changes in optical properties thin films were observed. Also, the frequency and voltage dependence of some dielectric properties of thin films have been evaluated using the admittance spectroscopy method in the wide frequency range of 10 kHz to 1 MHz at room temperature. Experimental results show that the real (ε') and imaginary parts (ε'') of dielectric constants, loss tangent (tanδ), real (M') and imaginary (M'') parts of electric modulus were strong functions of frequency and applied bias voltage in the depletion region. The loss tangent versus applied bias voltage curves shows an increase with increasing frequencies and shifts to applied forward bias region giving a peak at about 3 V. M' and M'' values decreased with increasing frequency and shifts to reverse bias region. In addition, it was determined that a.c. electrical conductivity (σ∗) values of thin films increased with increasing voltage as a function of dielectric loss.

Dielectric Loss Tangent Extraction Using Modal Measurements and 2-D Cross-Sectional Analysis for Multilayer PCBs

Frequency-dependent electrical properties of dielectric materials are one of the most important factors for high-speed signal integrity design. To accurately characterize material's dielectric loss tangent (tanδ) after multilayer printed circuit board fabrication a novel method was proposed recently to extract tanδ using coupled striplines' measured S-parameters and cross-section geometry. By relating modal attenuation factors to the ratio between the differential and common mode per-unit-length resistances, the surface roughness contribution is eliminated and the contributions of dielectric and conductor loss are separated. Here, we specifically decided to avoid using any physical dielectric model in the extraction algorithm in order to eliminate a need for any a priori information about dielectric behavior. Further analysis and improvement of the tanδ extraction approach is presented in this article. To evaluate the accuracy of the extraction, the impact of errors due to de-embedding, vector network analyzer measurement, and two-dimensional solver's calculation are taken into account by a statistical error model. A confidence interval of extracted tanδ is provided. To describe the frequency dependence of tanδ, a two-term Djordjevic model is proposed to fit the extracted tanδ curve, which guarantees causality and gives better agreement with measured insertion loss compared to the traditional Djordjevic model.

Dielectric Property and Space Charge Behavior of Polyimide/Silicon Nitride Nanocomposite Films.

Polymeric materials have many applications in multiple industries. In this paper, silicon nitride nanoparticles (Si3N4) were incorporated into a polyimide (PI) matrix to obtain composite films via the in situ polymerization method. The Si3N4 nanoparticles were consistently scattered in the composites, and the thickness of PI/Si3N4 films was around 50 µm. The effects of nanoparticle content on the dielectric constant, loss tangent and breakdown strength were simultaneously studied. A 3 wt.% doped PI/Si3N4 film revealled excellent dielectric properties, a dielectric constant (ε) of 3.62, a dielectric loss tangent (tanδ) of 0.038, and a breakdown strength of 237.42 MV/m. The addition of Si3N4 formed an interface layer inside PI, resulting in a large amount of space charge polarization in the electric field. The space charge of materials from the microscopic point of view was analyzed. The results show that there are trapenergy levels in the composites, which can be used as a composite carrier center and transport channel, effectively improving the performance of a small amount of nanoparticles film.

Fluorine/adamantane modified cyanate resins with wonderful interfacial bonding strength with PBO fibers

Novel compound (AEAF) with both cage-type adamantanes and fluorine-containing structures was synthesized from bisphenol AF, 1-adamantyl chloride and epichlorohydrin through successive esterification and O-alkylation reaction, which was then introduced into the curing networks of bisphenol A cyanate ester (BADCy) resins through copolymerization, to obtain AEAF-co-BADCy resins. AEAF presented low polarizability & dipole density, rigid cage adamantane, and stable CF3 group. When the mass fraction of AEAF was 6 wt%, AEAF-co-BADCy resins displayed the minimum real part (ε′r), imaginary part (ε”r) of complex permittivity, and dielectric loss tangent (tanδ) values, which were 2.49, 0.012, and 0.0048, respectively. And the corresponding wave transmission efficiency (T) was 92.3%, significantly higher than that of pure BADCy (86.6%). AEAF-co-BADCy resins also possessed excellent mechanical properties and better interfacial compatibilities with poly(p-phenylene-2,6-benzobisoxazole) (PBO) fibers. The corresponding flexural strength (126.5 MPa) and impact strength (15.2 kJ m−2) were increased by 16.6% and 47.6%, in comparison to pure BADCy (flexural strength of 108.5 MPa and impact strength of 10.3 kJ m−2). Meantime, the single fiber pull-out strength of PBO fibers/AEAF-co-BADCy (6 wt% AEAF) micro-composites also displayed an increase from 3.1 MPa (PBO fibers/BADCy) to 3.4 MPa.

Dopant incited alterations in structural, morphological, optical, and dielectric properties of Er-doped LaCrO3

The crystalline samples of La1−xErxCrO3 (x = 0.0, 0.2, 0.4, 0.6) system have been synthesized through the sol–gel process. The XRD pattern of the pristine LaCrO3 displays the single-phase characteristics having orthorhombic crystal structure with Pnma space group. On the other hand, the Er-doped samples exhibit the mixed-phase attributes of both parent and ErCrO3 compounds. The structural alteration from LaCrO3 to ErCrO3 increases with the increase in doping content. The escalation in the Er doping amount leads to a decline in the crystallite size and unit cell volume. TEM analysis verifies that the particle size reduces from 423 to 328 nm, as the content of Er in the crystal lattice is increased. The UV/Vis spectroscopy specifies that the energy band gap (Eg) values rise slightly with the increment in the doping quantity of Er in the LaCrO3. The Urbach energy is also found to increase in the doped samples. The effect of Er doping on optical constants namely refractive index, extinction coefficient, and optical conductivity has been investigated. The study on dielectric parameters infers that the dielectric constant and loss tangent (tanδ) display the typical dispersive behavior attributed to the Maxwell–Wagner interfacial polarization. These samples follow the UDR model only in the high-frequency regime. The electric modulus exploration ascertained that grains are mainly involved in the conduction process in these samples. The frequency-dependent ac conductivity plot indicated that these samples follow the Jonscher empirical power law in the given frequency range.

Influence of Zinc Oxide Nanoparticles on the Optical, Dielectric and Electromagnetic Interference Shielding Performance of Polystyrene Films

In the present work, Zinc oxide (ZnO) nanoparticles are synthesized using solvothermal technique. Polystyrene-ZnO (PS/ZnO) nanocomposite films are synthesized by solution casting procedure. PS/ZnO films are analyzed by XRD, FTIR and UV-Vis spectroscopic techniques. The addition of ZnO into the PS film is found to decrease the optical band gap (OBG) from 4.07 eV to 1.86 eV. Frequency dependence of dielectric constant (ε′), loss tangent (tanδ), ac conductivity (σac) and electromagnetic (EM) interference shielding effectiveness (SE) studies have been undertaken on the pure PS and PS/ZnO films. Insertion of ZnO into pure PS polymer matrix is found to enhance ε′, tanδ, σac, and SE considerably. The ε′ and tanδ were reduced with an enhancement in the frequency. σac of PS/ZnO nanocomposites was enhanced with rise in frequency and electrical conduction process in PS/ZnO film is in agreement with an electron-hopping model. EM interference SE is reduced with rise in the frequency. PS/ZnO films were proven as a favorable functional substance for the absorbing of EM waves at lower frequencies.

Process-structure-property correlation of (1 − x)CoFe2O4 + xBaTiO3 (x = 0.2, 0.5, 0.8) composites

The (1 − x)CoFe2O4 + xBaTiO3 (x = 0.2, 0.5, 0.8) magnetoelectric (ME) composites were prepared by solid state method. The structural feature of as-prepared ceramics were characterized and studied systematically by using XRD, and Raman. The dielectric properties were measured by LCR Meter Bridge. Variation of dielectric properties (dielectric constant and dielectric loss) with frequency range of 1000 Hz–1 MHz were studied. The AC conductivity were calculated from dielectric constant (ε’) and loss tangent (tanδ). The conduction phenomenon was explained on the basis of small polaron hopping model. The composites show excellent ferroelectric properties. The morphological feature of the selected composites; fractured as well as thermally etched has been studied by scanning electron microscopy. The relationship between such properties, chemical composition and sintering temperatures are thoroughly discussed.

Dielectric Losses in Hydrogen-Saturated VT1-0 Titanium Induced by Eddy Current Propagation

Dielectric loss tangent tanδ in hydrogen-saturated VT1-0 titanium has been studied in the hydrogen concentration range 190–2000 ppm and eddy current frequency interval 200–1000 kHz. The frequency dependence of tanδ has two distinct peaks indicating that hydrogen is nonuniformly distributed along the depth of the titanium sample. It is supposed that this approach can be used to determine the hydrogen concentration in hydrogen-saturated VT1-0 metal.

Фазовый переход полупроводник--суперионик в пленках сульфида серебра

Frequency dependences of dielectric loss tangent tanδ (f) and Cole-Cole diagram of thin films of silver sulfide at various temperatures in the range 0-200 ° C were studied. A comparison of experimental data with the results of calculation of electrical circuit complex impedance of Ag2S samples is made. The comparison is made for temperatures before and after semiconductor-superionic phase transition. Based on the analysis of experimental results and literature data, a microscopic model of the phase transition in Ag2S is proposed.

Исследование диэлектрических свойств сополимеров на основе 2,3,4,5,6-пентафторстирола, стирола, 4-фтор-α-метилстирола и α-метилстирола

Three new copolymers based on fluorine-containing derivatives of styrene and α-methylstyrene were obtained. According to the results of the previous stages of the study, copolymers based on styrene derivatives have improved dielectric properties compared to polystyrene and a copolymer of styrene and α-methyl styrene. The dielectric constant ε and dielectric loss tangent tanδ were measured for the initial and synthesized samples of styrene – α-methyl styrene copolymer at Samara Electromechanical Plant OJ-SC (Samara city, Russia). All measurements of dielectric characteristics were carried out at an alternating current frequency of 10 GHz on a pressed copolymer tablet with a diameter of 10 and a thickness of 3 mm. During the experiment, a measuring stand was used, consisting of a high-frequency signal generator G4-83, an electronically counting frequency meter Ch3-54 with a frequency converter YaZCh-43, a measuring amplifier U2-4; low-frequency signal generator G3-109; measuring unit FKDG 418151.002. The results obtained indicate high values of the dielectric constant. For samples of copolymers of α-methylstyrene – 4-fluoro-α-methylstyrene and styrene – 4-fluoro-α-methylstyrene, values of 4.63 and 4.21, respectively, were obtained. These dielectric permittivity values are superior not only to samples previously obtained during the experiment, but also to some other compounds that are widely used in industry. In particular, the dielectric constant of lavsan, which is used in the manufacture of capacitors, is 3.1-3.3. The improved dielectric constant values are probably related to the high-quality composition of the copolymer. Samples of the copolymer containing 4-fluoro-α-methylstyrene are significantly superior to the copolymer with 2,3,4,5,6-pentafluorostyrene for this characteristic. The values of the dielectric loss tangent are in the range from 8.74∙10−4 to 37.4∙10−4. Given the dielectric characteristics of the synthesized copolymers, we can conclude that there are good prospects for the use of fluorine-containing styrene copolymers. The obtained values of permittivity and dielectric loss tangent indicate a good possible competitiveness of new materials based on new copolymers. In the future, it is planned to study a number of other physicochemical properties of these materials in order to obtain the most complete spectrum of their characteristics.

Phase transition, ferroelectric and piezoelectric properties of B-site complex cations (Fe0.5Nb0.5)4+-modified Ba0.70Ca0.30TiO3 ceramics

Ba0.70Ca0.30Ti1-x (Nb0.5Fe0.5)xO3 lead-free ceramics (abbreviated as BCTNFx, x = 0–0.12) were prepared by solid-state reaction method. The influence of B-site (Fe0.5Nb0.5)4+ substitution on phase structure, microstructure, dielectric, ferroelectric and piezoelectric properties of Ba0.70Ca0.30TiO3 ceramics were systematically studied. The BCTNFx ceramics consist of diphasic tetragonal (T) and orthorhombic (O) phases at x = 0–0.04, pseudocubic (PC) and O phases at x = 0.05–0.08, cubic (C) and O phases at 0.08 < x ≤ 0.12. Increase of (Fe0.5Nb0.5)4+ doping improves sinterability, depresses the ferroelectric - paraelectric phase transition temperature (Tm) monotonically from 128 °C at x = 0 to -86 °C at x = 0.12, induces enhanced relaxor behavior and weakens piezoelectric properties. The room temperature relative dielectric constant (εr) and dielectric loss tangent (tanδ) increase with increasing x and reach the maximum values of 4869 and 0.06 respectively at x = 0.06. Whereas the average grain size (abbreviated as AGS), ferroelectric properties and electric field induced strain increase significantly by introducing 2.0 mol% B-site complex cations (Fe0.5Nb0.5)4+ into Ba0.70Ca0.30TiO3 ceramics. The BCTNF0.02 ceramics achieve optimal electrical properties with εr = 1268, tan δ = 0.03, Tm = 102 °C, Pmax = 12.8 μC/cm2, Pr = 6.1 μC/cm2, EC = 6.0 kV/cm, d33 = 117 pC/N, kp% = 0.18%, Qm = 236, bipolar Smax% = 0.20%, unipolar Smax% = 0.16% and d33∗ = 314 pm/V. The variation of electrical properties of BCTNFx ceramics is attributed to the combined action of grain size effect, phase transition, weakness of octahedral distortion, clamping effects of the internal bias electric field Ei on domain wall motion induced by B-site cations (Fe0.5Nb0.5)4+ displacement.

Magnetic and broadband dielectric studies of calcium-substituted LiFe5O8

The non-magnetic element Ca is substituted in LiFe5O8 (x = 0, 0.003, 0.005, 0.007 and 0.01) and the effect of Ca on magnetic, dielectric and electrical properties over a broadband frequency and temperature range (both at cryogenic and high temperatures) are investigated in order to check their suitability in microwave devices. The X-ray diffraction (XRD) study revealed the increment in the lattice constant and volume, which is also confirmed from the redshift in F2 Raman mode. The M-T curves of all the samples exhibited a ferromagnetic transition around 873 K. The effective magnetization and saturation magnetization is reduced with Ca substitution due to the incorporation of non-magnetic ions in place of magnetic ions, whereas the coercivity and remanent magnetization enhanced. These changes are explained based on Neel's two-sublattice model. The x = 0.007 specimen exhibited the highest permeability (µr = 28 @ 1 MHz, room temperature (RT) and µr = 52 @ 1 MHz, 523 K) among all the Ca substituted samples. Both the permittivity and permeability showed dispersion behavior with temperature. With Ca substitution, the permittivity improved, whereas the dielectric loss tangent (tanδ; order of 10−3) reduced. The activation energy is found to be 0.14 eV and 0.06 eV for x = 0 and 0.007, respectively. The reduction in activation energy can be ascribed to the creation of oxygen vacancies. A combination of permeability, low tanδ, enhanced permittivity, and high saturation magnetization obtained for the x = 0.007 sample is suitable for the applications in circulators and phase shifters.