CaBi_(2)Ta_(2)O_(9)基压电陶瓷改性研究

摘要

该文采用传统固态反应法制备了Ca_(1-x)(Li_(0.5)Ce_(0.4)Pr_(0.1))_(x)Bi_(2)Ta_(2)O_(9)(x为摩尔分数)陶瓷,研究了(Li_(0.5)Ce_(0.4)Pr_(0.1))^(2+)复合离子不同掺杂浓度对陶瓷结构和电学性质的影响。结果表明,在选定浓度范围内,(Li_(0.5)Ce_(0.4)Pr_(0.1))^(2+)复合离子改善了CaBi_(2)Ta_(2)O_(9)基陶瓷的压电活性与高温下的直流电阻等特性。当x=0.08时,陶瓷具有最佳综合性能,即压电常数d_(33)=10.3 pC/N,居里温度T_(C)=928℃,直流电阻率ρ=1.12×10^(6)Ω·cm(650℃),介电损耗tanδ=0.026(1 MHz,650℃)。