论文标题
极性状态为0.67BifeO3-0.33BATIO3在形态相边界附近
Polar state of 0.67BiFeO3-0.33BaTiO3 near the morphotropic phase boundary
论文作者
论文摘要
对BF-BT中未固定状态和螺旋状态的结构质体关系的对称研究（0.67bifeO3-0.33BATIO3（0.67BF-0.33BT））进行了对称研究。观察到典型的松弛型电介质异常（TF，〜627 K）。在加热期间，电晶石（SM）的残余极化（PR）和最大值（PR，〜40 uc/cm2; SM，在453 K下40 kV/cm以下）明显增加。第一循环电 - 晶回路表示极性状态在0.67bf-0.33bt和0.94binatio3-0.06batio3之间的差异。未固定和螺栓的样品都具有相似的频率分散行为。即使在螺纹样品中，千古弛豫状态和类似铁电状态之间的过渡也不涉及清晰的介电异常。基于XRD模式，明亮场图像和选定的面积电子衍射（SAED）的Rietveld细化的分析表明，在Poling Field下，远程铁电域的形成很困难。
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.
