Dielectric and piezoelectric properties of（Li,Ce） modified NaBi5Ti5O18 composite ceramics
来源期刊：Journal of Rare Earths2009年第3期
论文作者：马磊 赵琨 李吉夏 吴琪 赵明磊 王春雷
文章页码：496 - 500
摘 要：Nominal（Li0.5Ce0.5） x（Na0.5Bi0.5）（1-x） Na0.5Bi4.5Ti5O18 composite ceramics were fabricated using conventional solid-state reaction method. The coexistence of bismuth layer-structured phase and perovskite phase was determined in these ceramics using XRD technique. At room temperature,the x=0.11 sample showed the largest piezoelectric constant,d33,of about 26.5 pC/N and the largest electromechanical coupling factor,kt,of about 30%. Even after annealing at 500 °C,the value of d33 was still about 19 pC/N,in x=0.08-0.11 samples. Moreover,these composite ceramics showed low temperature coefficients of dielectric constant and high electrical resistivity in the temperature region of 450-550 °C. These results indicated that（Li,Ce） modified NaBi5Ti5O18 composite ceramics were promising piezoelectric materials for high-temperature applications.
马磊，赵琨，李吉夏，吴琪，赵明磊，王春雷
摘 要：Nominal（Li0.5Ce0.5） x（Na0.5Bi0.5）（1-x） Na0.5Bi4.5Ti5O18 composite ceramics were fabricated using conventional solid-state reaction method. The coexistence of bismuth layer-structured phase and perovskite phase was determined in these ceramics using XRD technique. At room temperature,the x=0.11 sample showed the largest piezoelectric constant,d33,of about 26.5 pC/N and the largest electromechanical coupling factor,kt,of about 30%. Even after annealing at 500 °C,the value of d33 was still about 19 pC/N,in x=0.08-0.11 samples. Moreover,these composite ceramics showed low temperature coefficients of dielectric constant and high electrical resistivity in the temperature region of 450-550 °C. These results indicated that（Li,Ce） modified NaBi5Ti5O18 composite ceramics were promising piezoelectric materials for high-temperature applications.
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