Abstract Some yttrium modified BiFeO3–PbTiO3 (BYFO-PT) compounds have been fabricated using a standard ceramic technology (solid-state route). The structural analysis from X-ray diffraction (XRD) data ensures the formation of the rhombohedral phase of the compounds. The prepared materials have major bismuth ferrite (70%) and lead titanate (30%) with few impurity phases. The materials are found to have a high dielectric constant and low tangent loss. The relaxation mechanism is identified from the peaks appearing in impedance and modulus curves. The materials show a negative temperature coefficient of resistance (NTCR) semiconductor type behavior in the temperature range of 250 °C–400 °C. In addition, grain and grain boundary effects are observed through the Nyquist plots. The activation energy (Ea) of the compounds is calculated from the slope of inverse temperature versus AC conductivity at the high-temperature range. The ferroelectric nature of the compounds is confirmed by electric field dependent polarization (PE-hysteresis) loops.

中文翻译：

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钇改性 0.7BiFeO3-0.3PbTiO3 的结构、介电和电学特性

摘要 一些钇改性的 BiFeO3–PbTiO3 (BYFO-PT) 化合物已使用标准陶瓷技术（固态路线）制造。X 射线衍射 (XRD) 数据的结构分析确保了化合物菱面体相的形成。制备的材料主要为铁酸铋（70%）和钛酸铅（30%），杂质相很少。发现这些材料具有高介电常数和低切线损耗。从阻抗和模量曲线中出现的峰值确定松弛机制。该材料在 250 °C–400 °C 的温度范围内显示出负电阻温度系数 (NTCR) 半导体类型行为。此外，通过 Nyquist 图观察到晶粒和晶界效应。化合物的活化能 (Ea) 是根据高温范围内逆温度与交流电导率的斜率计算得出的。这些化合物的铁电性质通过电场相关极化（PE 滞后）回路得到证实。