Ferroelectric and Dielectric Properties of Solid Solution Ceramics Based on Bismuth Ferrite and Lead Ferroniobate Multiferroics with Germanium Dioxide Additive

Ferroelectric and dielectric characteristics of multiferroics solid solutions ceramics of the (1 – x)BiFeO3 − xPbFe0.5Nb0.5O3 composition with x = 0.3, modified superstoichiometrically with GeO2 in amounts (0.5–1.0) wt.%, were studied. It is noted that the temperature dependencies of the real part of the complex dielectric permittivity and the dielectric loss tangent exhibit anomalies in the vicinity of the ferroelectric phase transition, while the nature of their changes in the vicinity of the latter allows us to classify the studied objects as ferroelectrics with a diffuse phase transition. The ferroelectric properties of the modified objects at room temperature indicate that it was not possible to obtain saturated dielectric hysteresis loops for all samples in the analyzed field range. This is apparently due to high coercive fields indicating improved electrical strength of ceramics. In this regard, it is advisable to use materials, based on 0.7BiFeO3 − 0.3PbFe0.5Nb0.5O3 solid solutions, developed during the research, to create and study new multifunctional media with special electrophysical parameters, promising for applications in innovative areas of electronics.