| 弛豫铁电多晶体的强场特性 |
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| 引用本文： | 庄志强. 弛豫铁电多晶体的强场特性[J]. 华南理工大学学报(自然科学版), 1989, 17(3): 43-51 |
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| 作者姓名： | 庄志强 |
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| 作者单位： | 华南理工大学无机材料科学与工程系 |
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| 摘 要： | 本文介绍了弛豫铁电多晶体的研究、发展及其电致伸缩性质。论文中比较了三种典型铁电弛豫体:PMN—PT、PLZT和掺杂BT多晶材料的强电场特性。实验发现,当温度偏离T_(av)时,PLZT多晶体出现越来越强的电滞后现象,导致其微位移器件的回零复原温度特性变坏。用电学方法,在碱土金属离子B位掺杂的BT多晶体中可以观察到超顺电相的所谓微畴——宏观畴的场诱相变过程。作者指出,化学缺陷控制原理可用于调节电致伸缩材料的强场特性,控制器件的复原特性。
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| 关 键 词： | 弛豫 铁电晶体 电致伸缩 |
CHARACTERISTICS OF FERROELECTRIC POLYCRYSTALLINE WITH DIFFUSE PHASE TRANSITION UNDER HIGH ELECTRIC FIELD STRENGTH |
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| Zhuang Zhiqiang Dept.of Inorg Mat.Sci., Eng.,South China Univ.of Tech.. CHARACTERISTICS OF FERROELECTRIC POLYCRYSTALLINE WITH DIFFUSE PHASE TRANSITION UNDER HIGH ELECTRIC FIELD STRENGTH[J]. Journal of South China University of Technology(Natural Science Edition), 1989, 17(3): 43-51 |
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| Authors: | Zhuang Zhiqiang Dept.of Inorg Mat.Sci.& Eng. South China Univ.of Tech. |
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| Abstract: | A review of the research and developement of ferroelectric rel- axors,and their electrostrictive properties is given.A comparison between ferroelectric relaxors,PMN-PT,PLZT and dopped BaTiO_3, also is presented.when temperatures are far away from T_(av),strong dielectric hysteresis occurs for PLZT8.7/65/35 ceramic,and it is impossible for the recovery of the micropositionor/electrostrictor, which is made of the compositon,under a given electric field stre- lngth.A micro-domain to macro-domain transfer of dopped-BaTiO_3 could be observed with a dielectric method.It is shown that the high-electric field peoperties of ferroelectric relaxors may be adju- sted through the control of the chemical defect and also the recovery of the micropositonor in the displacement. |
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| Keywords: | electrostriction coprecipitation sol-gel process ferroelectrics dielectric hysteresis BaTiO_3 PMN-PT PLZT |
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