Composition and temperature-induced structure evolution in Bi0.5Na0.5TiO3-based solid solutions
Composition and temperature-induced structure evolution in Bi0.5Na0.5TiO3-based solid solutions
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DOI：
10.1007/s10853-011-5796-x
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发表时间：
2011
影响因子：
4.5
通讯作者：
Feifei Wang;Min Xu;C. Leung;Yanxue Tang;Tao Wang;Xinman Chen;W. Shi
中科院分区：
文献类型：
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作者：
Feifei Wang;Min Xu;C. Leung;Yanxue Tang;Tao Wang;Xinman Chen;W. Shi
本文系统地研究了x在0.935.0 2~0.2 2范围内的(0.935.5%−x)Bi0.5 Na0.5TiO3-0.0 65BaTiO3-xSrTiO3(BNBSTx)的介电、铁电和极化电流特性与温度和成分的关系。在高温下，x=0.18的BNBSTx固溶体经历了从铁电到短程位移有序再到非极性相的转变。相应的转变温度随锶含量的增加而降低，临界成分x约为0.18-0.22。此外，最大介电常数温度Tm在x>；=0.18时几乎消失，这可能与复杂固溶体中某些亚晶格的形成有关，Tm表现出与频率无关的宽峰。
In this study, the temperature and composition dependence of the dielectric, ferroelectric properties, and polarization current characteristics of the (0.935 −x)Bi0.5Na0.5TiO3–0.065BaTiO3–xSrTiO3(BNBSTx) withxranging from 0.02 to 0.22 were systematically investigated. At elevated temperature the BNBSTxsolid solution withx< 0.18 underwent a transition from ferroelectric to short-range displacement order and then to non-polar phases. The corresponding transition temperature decreased with Sr contentxincreasing and the critical compositionxwas determined to be around 0.18–0.22. In addition, the maximum-permittivity temperatureTm, which exhibited broad peaks with nearly frequency-independent behavior, almost disappeared forx> 0.18, which may be related with the formation of certain sublattices in the complex solid solution.