Electric-field-temperature phase diagram of Mn-doped Bi0.5(Na0.9K0.1)0.5TiO3 ceramics
Electric-field-temperature phase diagram of Mn-doped Bi0.5(Na0.9K0.1)0.5TiO3 ceramics
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DOI：
10.1063/1.4938759
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发表时间：
2015-12
影响因子：
4
通讯作者：
Yoshitaka Ehara;N. Novak;S. Yasui;M. Itoh;K. Webber
中科院分区：
文献类型：
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作者：
Yoshitaka Ehara;N. Novak;S. Yasui;M. Itoh;K. Webber
研究了无铅掺杂的Bi(Na0.1K0.9)TiO3陶瓷的电场-温度（E-T）相图。x射线衍射、介电和极化测量揭示了弛豫行为，并用于表征非遍历弛豫、遍历弛豫和电场诱导铁电态的稳定区域。极化电流密度分布图表明，两个电场之间的转变，极化方向相反的诱导铁电态通过中间弛豫态经过两步过程产生。铁电态转换与中间弛豫态之间的相互作用是由极化弛豫动力学控制的。给出的E-T相图揭示了外加电场和温度对稳定区的影响。这是特别有趣的，因为Bi0.5(Na0.1K0.9)0.5TiO3陶瓷被提出作为一种潜在的压电陶瓷材料。
An electric field–temperature (E-T) phase diagram for a lead-free 0.5 mol. % Mn-doped Bi(Na0.1K0.9)TiO3 ceramics was investigated. The x-ray diffraction, dielectric and polarization measurements revealed relaxor behavior and were used to characterize the stability regions of the non-ergodic relaxor, ergodic relaxor and electric field induced ferroelectric states. As indicated by the polarization–current density profiles, transformation between two electric fields, induced ferroelectric states with opposite polarization direction arise via a two-step process through an intermediate relaxor state. Interplay between the ferroelectric state conversion and intermediate relaxor state is governed by the dynamics of polarization relaxation. The presented E-T phase diagram revealed the effects of the applied electric field and temperature on stability regions. This is of special interest since the Bi0.5(Na0.1K0.9)0.5TiO3 ceramics were proposed as a potential piezoceramic material.