arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2002.05312cond-mat.mtrl-sci
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准同型相界附近0.67BiFeO_3 - 0.33BaTiO_3的极性状态

Polar state of 0.67BiFeO3-0.33BaTiO3 near the morphotropic phase boundary

Yongxing Wei, Jiahao Shen, Chenxing Bai, Changqing Jin, Weitong Zhu, Ye Tian, Gang Xu

摘要:

对0.67BiFeO3-0.33BaTiO3(0.67BF-0.33BT)非极化态和极化态的结构-性能关系进行了对称性研究,以了解BF-BT中准同型相界(MPB)的起源。观察到典型的弛豫型介电异常(Tf,~627 K)。在453 K,40 kV/cm下,剩余极化强度(Pr)和电应变最大值(Sm)均明显增加(Pr约为40 μ C/cm ~ 2,Sm为0.191%)。第一循环的电应变回路表明0.67BF-0.33BT和0.94BiNaTiO 3 - 0.06BaTiO 3之间的极性状态的差异。非极化和极化样品具有相似的频散特性。即使在极化样品中,遍历弛豫态和类铁电态之间的转变也不涉及明显的介电异常。基于Rietveld精细化的XRD图谱、明场图像和选区电子衍射(SAED)的分析表明,在极化电场作用下,长程铁电畴的形成是困难的。

英文摘要:

The symmetric studies on the structure-property relationship of the unpoled and poled states of 0.67BiFeO3-0.33BaTiO3 (0.67BF-0.33BT) were conducted to understand the origin of the morphotropic phase boundary (MPB) in BF-BT. A typical relaxor-type dielectric anomaly was observed (Tf, ~627 K). The remnant polarization (Pr) and maximum value of electro-strain (Sm) increase clearly during heating (Pr, ~40 uC/cm2; Sm, 0.191 % under 40 kV/cm at 453 K). The first-cycle electro-strain loops indicate the difference in the polar state between 0.67BF-0.33BT and 0.94BiNaTiO3-0.06BaTiO3. Both the unpoled and poled samples have the similar frequency dispersion behaviors. Even in the poled samples, the transition between the ergodic relaxor state and ferroelectric-like state does not involve a clear dielectric anomaly. Analyses based on the Rietveld refinement of XRD patterns, bright-field images and selected-area electron diffractions (SAED) demonstrated that the formation of the long-range ferroelectric domains was difficult under the poling field.

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