铁电性
压电
相(物质)
相变
微观结构
复合材料
介电常数
四方晶系
铁电陶瓷
电场
多铁性
作者
Fang Kang,Lixue Zhang,Bo Huang,Pu Mao,Zepeng Wang,Qinzhao Sun,Jiping Wang,Dengwei Hu
标识
DOI:10.1016/j.jeurceramsoc.2019.12.026
摘要
Abstract High temperature lead-free piezoceramics of 0.06SrTiO3-0.94[(1-x)BaTiO3- xBiFeO3] were fabricated by the traditional solid state reaction method. The ceramics possess the pure perovskite structures, and a morphotropic phase boundary (MPB) with the pseudo-cubic and rhombohedral phases is observed at x = 0.55-0.71. The ceramics have the obvious relaxor behaviors as confirmed by the temperature and frequency dependent dielectric curves. The largest positive electrostrain (0.25%) under 65 kV/cm is achieved in the ceramics with x = 0.63. The ceramics with x = 0.63 also exhibit a large d33* (425 pm/V) with a high curie temperature (TC =282 °C) and a low hysteresis (43%). The improved electromechanical properties are attributed to the existence of relaxor behavior at BiFeO3-BaTiO3 phase boundary after doping SrTiO3. These results demonstrate that the design of a ternary system like ST-BF-BT based ceramics with relaxor behavior and phase boundary composition provides an effective way to optimize the electrostrain behavior of high temperature lead-free ceramics.
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