扩散铁电体$BaSn_{0.15}Ti_{0.85}O_{3}$中的重入现象：局域结构的观察和FORC研究
Re-entrant phenomenon in diffuse ferroelectric, $BaSn_{0.15}Ti_{0.85}O_{3}$ : Local structural insights and FORC study
摘要：
根据Lei等人提出的相图，[J. App. Phys 101，084105（2007）]，选择$BaSn_{0.15}Ti_{0.85}O_{3}$，显示出在室温附近立方到菱形（C-R）之间的扩散相变。介电分析证实了室温附近的相变（$T_{C}$ $\approx$ 290 K），并且还观察到朝向低温的介电常数的频率分散。极化曲线和一级反转曲线（FORC）表明，该系统在低温下是在重入相。总之，所有这些电特性的结果指向的弛豫行为在再入阶段。采用X射线吸收近边光谱、拉曼光谱和穆斯堡尔谱等局部探测技术，研究了低温介电异常区周围的局部环境变化。从这些结果中提出了一个简单的铁电交换模型来解释低温重入行为。
英文摘要：
From the phase diagram as proposed by Lei et.al., [J. App. Phys 101, 084105 (2007)] a $BaSn_{0.15}Ti_{0.85}O_{3}$ is chosen showing a diffuse phase transition between cubic to rhombohedral (C-R) near room temperature. Dielectric analysis confirms a phase transition near room temperature ($T_{C}$ $\approx$ 290 K) and also frequency dispersion in dielectric constant is observed towards low temperature. Polarization and first-order reversal curves (FORC) suggest that the system is in re-entrant phase at low temperatures. Put together, all these electrical characterization results points toward the relaxor behavior in the re-entrant phase. Local probe techniques such as x-ray absorption near edge spectroscopy, Raman and Mossbauer spectroscopy are employed to investigate the local environment changes around this region of low temperature dielectric anomaly. A simple ferroelectric exchange model explaining the low temperature re-entrant behavior is presented from these results.
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