【作者】 陈宏伟； 杨传仁； 裴亚芳； 张继华；

【Author】 CHEN Hong-wei YANG Chuan-ren PEI Ya-fang ZHANG Ji-hua (State Key Laboratory of Electronic Thin Films and Integrated Devices,University of Electronic Science & Technology of China,Chengdu 610054,China)

【机构】 电子科技大学电子薄膜与集成器件国家重点实验室；

【摘要】 研究了 Pb 含量对 Pb_xSr_1-xTiO₃（x=0．2～0．8） 陶瓷微结构和介电性能的影响,当 x＜0．45时,c/a≈1, 晶体为立方顺电相；x≥0．45时,cla＞1,晶体为四方铁电相；随着 Pb/Sr 比增大,PST 陶瓷气孔率下降,致密度增加,晶粒尺寸逐渐增大,居里峰近似线性地向高温方向移动,并具有一致的居里外斯常数,剩余极化强度 （P_r）、矫顽场强（E_c）都增大．更多还原

【Abstract】 The crystalline structure and dielectric properties of Pb_xSr_1-xTiO₃ ceramics with x=0.2～0.8 were investigated. The a-and c-axis lattice constants at room temperature were calculated and are found not to be equal,corresponding to tetragonal phase when x≥0.45,consistent with the X-ray diffraction spectra.The temperature dependence of the dielectric constant was studied.The increase of densification,grain size,coercive electric field and remanent polarization were the result of the increase of Pb/Sr ratio in Pb_xSr_1-xTiO₃ ceramics.更多还原