Polarization dynamics variation across the temperature- and composition-driven phase transitions in the lead-free Ba(Zr0.2Ti0.8)O3−x(Ba0.7Ca0.3)TiO3 ferroelectrics
Polarization dynamics variation across the temperature- and composition-driven phase transitions in the lead-free Ba(Zr0.2Ti0.8)O3−x(Ba0.7Ca0.3)TiO3 ferroelectrics
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DOI：
10.1063/1.4932641
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发表时间：
2015-10
影响因子：
3.2
通讯作者：
S. Zhukov;M. Acosta;Y. Genenko;H. Seggern
中科院分区：
文献类型：
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作者：
S. Zhukov;M. Acosta;Y. Genenko;H. Seggern
热激退极化电流（TSDC）和极化开关实验的方法在一个大的领域，时间和温度制度被用来细化有争议的相图Ba（Zr0.2Ti0.8）O3-x（Ba0.7Ca0.3）TiO 3和理解其关系的铁电和压电性能。TSDC结果表明，在0.30 ≤ x ≤ 0.60的组成范围内，存在三种铁电相，分别属于菱方（R）、正交（O）和四方（T）对称性。自发极化在整个中间相区域是最大的，其中极化切换的激活势垒很小，而不仅仅是在R-O或O-T边界，这可能是从以前的观察中推断出来的。
The method of thermally stimulated depolarization currents (TSDC) and polarization switching experiments over a large field, time, and temperature regime are used to refine the controversial phase diagram of Ba(Zr0.2Ti0.8)O3−x(Ba0.7Ca0.3)TiO3 and comprehend its relation to ferroelectric and piezoelectric properties. TSDC results suggest the existence of three ferroelectric phases for the composition range of 0.30 ≤ x ≤ 0.60, which can be assigned to the rhombohedral (R), presumably orthorhombic (O), and tetragonal (T) symmetries. Spontaneous polarization is maximal all over the entire intermediate phase region, where the activation barrier for polarization switching is small, not just at R-O or O-T boundaries as might be deduced from previous observations.