Structures and temperature-dependent electrical properties in Ba_0.8Sr_0.2TiO₃-BiAlO₃ electrostrictive ceramics

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• 作者：Chong Zhang ; Long Jiao ; Huajun Kang ; Zheng-Bin Gu ; Guo-Liang Yuan ; Jun Chen ; Shan-Tao Zhang
• 关键词：Ba0.8Sr0.2TiO3 ; BiAlO3 ; Strain ; Electrostrictive
• 刊名：Ceramics International
• 出版年：2012
• 出版时间：September, 2012
• 年：2012
• 卷：38
• 期：7
• 页码：5637-5642
• 全文大小：1210 K

文摘

Lead-free piezoceramics of (1 ? x)Ba_0.8Sr_0.2TiO₃-xBiAlO₃ [(1 ? x)BST-xBA (0 ¡Ü x ¡Ü 0.12)] have been synthesized and the structures and properties have been investigated systemically. X-ray diffraction patterns indicated that the solid solution limit is close to x = 0.04, and a morphotropic phase boundary (MPB) separating tetragonal and pseudocubic phases exists near x = 0.02. The ferroelectricity weakens monotonously with increasing x, accompanied by weakened butterfly shaped bipolar strain-electric field curves. The temperature dependent properties of the composition with x = 0.02 have been typically investigated, showing that with increasing temperature, the ferroelectricity tends to be weakened. Pure electrostrictive effect has been found in the compositions with x = 0.02 and 0.03 close to room temperature temperature. Based on the results, the effects of BA on structures and electric properties were discussed.