A high temperature piezoelectric ceramic: (1-x)(Bi0.9La0.1)FeO3-xPbTiO3 crystalline solutions
A high temperature piezoelectric ceramic: (1-x)(Bi0.9La0.1)FeO3-xPbTiO3 crystalline solutions
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DOI：
10.1109/tuffc.2009.1255
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发表时间：
2009-10
期刊：
影响因子：
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通讯作者：
Jianguo Chen;Yufa Qi;G. Shi;Shengwen Yu;Jinrong Cheng
中科院分区：
文献类型：
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作者：
Jianguo Chen;Yufa Qi;G. Shi;Shengwen Yu;Jinrong Cheng
用固相反应法制备了x=0.35、0.37、0.4、0.43和0.45的(1-x)(Bi0.9La0.1)FeO_3-xPbTiO_3(BLF-PT)晶体。X-射线衍射分析表明，BLF-PT为单一的钙钛矿相，x=0.4~0.43之间为四方和三方混合相。当x=0.4时，BLF-PT的居里温度达到460℃，比硬质Pb(Zr，Ti)O_3陶瓷的居里温度高出约80℃。当x=0.4时，BLF-PT的剩余极化和压电常数分别达到38mUC/cm2和112pC/N。当x=0.4时，BLF-PT的平面耦合因子Kp在高达360℃的温升下保持稳定。阻抗谱研究表明，BLF-PT的高温电导可能归因于材料内部氧空位的运动。我们的结果表明，BLF-PT是一种很有前途的高温应用候选材料。
(1-x)(Bi0.9La0.1)FeO3-xPbTiO3 (BLF-PT) crystalline solutions for x = 0.35, 0.37, 0.4, 0.43 and 0.45 have been prepared by the solid-state reaction method. The X-ray diffraction analysis shows that BLF-PT has a single perovskite phase with mixed tetragonal and rhombohedral phases between x = 0.4 and 0.43. The Curie temperature of BLF-PT for x = 0.4 attains 460degC, which is about 80degC higher than that of hard Pb(Zr,Ti)O3 ceramics. The remnant polarization and piezoelectric constant of BLF-PT for x = 0.4 reach 38 muC/cm2 and 112 pC/N, respectively. The planar coupling factor kp of BLF-PT for x = 0.4 remains stable at temperature increases of up to 360degC. The impedance spectroscopy study reveals that the high temperature conduction of BLF-PT may be attributed to the motion of oxygen vacancies within the material. Our results indicate that BLF-PT is a promising candidate for high temperature applications.