(Li_<0.5>Bi_<0.5>)で変性したPZT系セラミックスの相境界近傍での圧電温度特性 : 物性・応用

概要

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Lead zirconate-lead titanate ceramics, Pb (Zr_y Ti_<1-y>)O_3(PZT), are very important piezoelectric materials, because the piezoelectric ceramics near the morphotropic phase boundary (M. P.B. ) show very large piezoelectric activities. However, the temperature dependence of the frequency constant and the electromechanical coupling factor of these materials in the vicinity of the M. P. B. indicate complex behavior, because of the minimum Young's modulus at the M. P. B. Stable temperature dependence of frequency constant is desired for piezoelectric ceramic devices such as ceramic filter, actuator, and so forth. In the PZT system, the M. P. B. has a slight tilt to the PbZrO_3 side and the degree depends on the ratio of the modified A site ions. The tilt of the M. P. B. was used to improve the temperature dependence of frequency constant of the piezoelectric ceramics with composition near the M. P. B. without decreasing the high value of the coupling factor. In this work, (Li_<0.5>Bi_<0.5>)-modified PZT system, (Li_<0.5>Bi_<0.5>)_xPb_<1-x>(Zr_yTi<1-x>)O_3(PZT 100 x/100y) , was selected. The improved ceramics have high coupling factors of more than 60%, from room temperature to 120℃. The temperature coefficient of the frequency constant in the planar mode is -16 ppm/℃ at 30℃, smaller than that of the conventional PZT ceramics
社団法人日本セラミックス協会の論文
1990-08-01