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La掺杂诱发层状钙钛矿型铁电体弛豫性相变的介电研究

惠荣 朱骏 卢网平 毛翔宇 羌锋 陈小兵

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La掺杂诱发层状钙钛矿型铁电体弛豫性相变的介电研究

惠荣, 朱骏, 卢网平, 毛翔宇, 羌锋, 陈小兵

Dielectric study on relaxor-like phase transition of lanthanum doped bismuth layer-structured ferroelectrics

Hui Rong, Zhu Jun, Lu Wang-Ping, Mao Xiang-Yu, Qiang Feng, Chen Xiao-Bing
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  • 制备了La掺杂层状钙钛矿铁电体材料SrBi4Ti4O15, Sr2Bi4Ti5O18以及共生结构Bi4Ti3O12-SrBi4Ti4O15,通过研究样品的变温介电特性发现,SrBi4-xLax
    Lanthanum doped bismuth layer-structured ferroelectrics and its intergrowth type, SrBi4-xLaxTi4O15, Sr2LaxBi4-xTi5O18, and (Bi,La)4Ti3O12-Sr(Bi,La)4Ti4O15, have been prepared by solid-state reaction method. The dielectric properties of those materials are measured. The results show that SrBi4-xLaxTi4O15 (x=1.0), Sr2LaxBi4-xTi5O18(x≥0.5), (Bi,La)4Ti3O12-Sr(Bi,La)4Ti4O15(x=1.50) exhibit typical relaxational characteristics. The degree of diffuseness and relaxation increased with increasing La3+ content. The origin of relaxation is the microdomain induced by La3+ doing. The micromechanism corresponding to the transition between normal ferroelectrics and relaxors is explained as the transition from the macrodomain of normal ferroelectrics to the microdomain of relaxors.
    • 基金项目: 国家自然科学基金(批准号:10274066)和江苏省教育厅自然科学基金(批准号:01KJB140011)资助的课题.
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  • 文章访问数:  6972
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  • 被引次数: 0
出版历程
  • 收稿日期:  2003-03-14
  • 修回日期:  2003-04-09
  • 刊出日期:  2004-01-15

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