Ceramics based on lead zirconate-titanate Pb(Zr_0.70Ti_0.30)O₃ (PZT), bismuth manganite (BM) and the composite (1 − x) PZT–x BM were obtained. A systematic study of linear and nonlinear dielectric susceptibilities temperature and frequency dependences was conducted. A composition-induced crossover in nonlinear dielectric susceptibility was detected. The so-called scaled nonlinear susceptibility, a₃, was obtained from experimental values of the real part of the linear and third-order nonlinear dielectric susceptibilities. The value for a₃ was negative for low BM content in the whole temperature range specific to discontinuous ferroelectric phase transitions and relaxor behavior. In contradiction, a₃ was positive for BM and for the composite with sufficiently high BM content. The positive a₃ was attributed to a subsystem of dipoles created by trapped charges. Hopping charge transfer, which is a dominant mechanism for conduction in manganites, is responsible for the positive a₃ and for the colossal magnitude of the imaginary part of the linear dielectric susceptibility. The concentration of the ions was determined using scanning electron microscopy. The chemical disorder and the precipitation of ions determined using time of flight–secondary ion mass spectrometry correspond to a crossover in the electrical features.

获得了基于锆钛酸铅Pb（Zr _0.70 Ti _0.30）O ₃（PZT），铋锰酸锰（BM）和复合物（1-  x）PZT– x BM的陶瓷。进行了线性和非线性介电常数对温度和频率依赖性的系统研究。检测到由成分引起的非线性介电敏感性的交叉。从线性和三阶非线性电介质磁化率实部的实验值获得了所谓的标度非线性磁化率a ₃。为值一₃在不连续铁电相变和弛豫行为特有的整个温度范围内，低BM含量均为负值。相反，对于BM和具有足够高BM含量的复合材料，a为₃。正a ₃归因于由俘获电荷产生的偶极子子系统。跃迁电荷转移是锰中导电的主要机制，其正a ₃对于线性电介质磁化率虚部的巨大幅度。使用扫描电子显微镜确定离子的浓度。使用飞行时间-二次离子质谱法确定的化学无序和离子沉淀对应于电子特征的交叉。