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In this study, a series of SrGa0.02Fe11.98O19-Zn0.5Ni0.5Fe2O4 hard/soft nanocomposites (SrGaFeO-ZnNiFeO H/S NCs) were synthesized via a single-pot (citrate sol–gel) approach by applying different calcination temperatures. The electrical and dielectric properties of the SrGaFeO-ZnNiFeO H/S NCs based on the calcination temperatures in between 800 and 1100 °C were systematically investigated with an impedance analyzer of up to 3.0 MHz frequency and within 20 and 120 °C temperature range. Both electrical and dielectric parameters, such as ac/dc conductivity, dielectric loss, dielectric constant, and tangent loss, were measured for a given calcination temperature. It has been found that AC conductivity generally conforms the power law rules, largely dependent on calcination temperatures. Impedance analysis has observed that the conduction mechanisms of SrGaFeO-ZnNiFeO H/S NCs at various calcination temperatures are mainly attributable to grain–grain boundaries. The dielectric constant of SrGaFeO-ZnNiFeO H/S NCs shows normal dielectric distribution with frequency, largely dependent on calcination temperatures. Ultimately, the observed change in dielectric properties with frequency can be attributed to the conduction mechanism in most compound ferrites, which can be phenomenologically explained by Koop's model. [ABSTRACT FROM AUTHOR]

In this paper, the structural, morphological, electrical and dielectric properties of hard/soft ferrite nanocomposites (NCs) of CoFe 2 O 4 /(NiSc 0.03 Fe 1.97 O 4) x (where x = 1, 2, 3, 4, 5) have been investigated. The hard/soft NCs were manufactured with one pot sol-gel auto-combustion procedure. The electrical and dielectric properties of the products were explored with and between 20 and 120 °C temperature range up to 3 MHz. Dielectric and electrical features like ac/dc conductivity dielectric constant, dielectric loss and tangent loss were evaluated for a variety of compositional ratios of x = 1–5 including NiSc 0.03 Fe 1.97 O 4 and CoFe 2 O 4 NPs. The AC conductivity commonly obeys the power law rules, largely dependent on compositional ratios as mentioned earlier. Impedance analysis has the conduction mechanisms of hard/soft NCs at various compositional ratios are mainly due to grain-grain boundaries. The dielectric constant of the CoFe 2 O 4 and NiSc 0.03 Fe 1.97 O 4 NPs leads to normal dielectric distribution with frequency, largely dependent on compositional ratios. In general, the variation in the dielectric properties of hard/soft NCs caused by the conduction mechanism in ferrites. • Sol-gel auto-combustion procedure was employed to synthesize the hard/soft ferrites. • The AC conductivity generally largely dependent on compositional ratios. • Impedance analysis has observed that the conduction mechanisms of hard/soft NCs are mainly due to grain-grain boundaries. • The dielectric constant largely dependent on compositional ratios. [ABSTRACT FROM AUTHOR]