Abstract LiTaO3 (LT)-modified (1 − x)(0.675BiFeO3–0.325BaTiO3) + 0.6 mol% MnO2 + 0.4 mol% CuO (BFBTMC–xLT, where x = 0–0.030) ceramics were synthesized by solid state reaction method. The crystal symmetry, ferroelectric response, and temperature stable dielectric properties were investigated as a function of different LT-content. The X-ray diffraction study of BFBTMC–LT piezoceramics revealed no remarkable variation in the crystal symmetry. The value of maximum polarization (Pm ≈ 24 μC/cm2) and remnant polarization (Pr ≈ 18 μC/cm2) were obtained at BFBTMC–0.010LT composition. The maximum temperature of permittivity (Tmax) decreased by the addition of LT-content in BFBTMC materials. The un-doped sample was ferroelectric; a change to relaxor behavior occurred by the addition of LT-content, with broad frequency dependent curves of dielectric mid-value permittivity (ermid) and tangent loss as a function of temperature. A significant enhancement occurred at 3 mol% LT-modified BFBTMC ceramics, with ermid = 5000 ± 9.5% (250–450 °C at 1 kHz). These results are favorable for practical applications in high temperature dielectrics.

中文翻译：

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LiTaO 3 陶瓷改性无铅BiFeO 3 –BaTiO 3 的温度稳定介电性能

摘要 LiTaO3 (LT) 改性 (1 − x)(0.675BiFeO3–0.325BaTiO3) + 0.6 mol% MnO2 + 0.4 mol% CuO（BFBTMC–xLT，其中 x = 0–0.030）陶瓷是通过固态反应法合成的。研究了晶体对称性、铁电响应和温度稳定介电特性与不同 LT 含量的关系。BFBTMC-LT 压电陶瓷的 X 射线衍射研究显示晶体对称性没有显着变化。最大极化值 (Pm ≈ 24 μC/cm2) 和剩余极化值 (Pr ≈ 18 μC/cm2) 是在 BFBTMC–0.010LT 组成下获得的。通过在 BFBTMC 材料中添加 LT 含量，介电常数的最高温度 (Tmax) 降低。未掺杂的样品是铁电体；通过添加 LT 含量发生了松弛行为的变化，具有作为温度函数的介电中值介电常数 (ermid) 和切线损耗的宽频率相关曲线。3 mol% LT 改性 BFBTMC 陶瓷的显着增强，ermid = 5000 ± 9.5%（250–450 °C，1 kHz）。这些结果有利于高温电介质的实际应用。