Time-dependent ferroelectric transition in Pb(1−x)(Zr0.4Ti0.6)(1−x/4)O3 − xLa system
Time-dependent ferroelectric transition in Pb(1−x)(Zr0.4Ti0.6)(1−x/4)O3 − xLa system
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DOI：
10.1063/1.4809577
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发表时间：
2013-06
影响因子：
4
通讯作者：
Zhimin Sun;D. Xue;Haijun Wu;Yuanchao Ji;Xiangdong Ding;Dong Wang;Yaodong Yang;X. Ren
中科院分区：
文献类型：
--
作者：
Zhimin Sun;D. Xue;Haijun Wu;Yuanchao Ji;Xiangdong Ding;Dong Wang;Yaodong Yang;X. Ren
铁电转变涉及离子在晶胞内的微小移动，因此本质上是一个非常快的过程，没有明显的时间依赖性。与传统观点相反，在这里我们报告了一个时间依赖性的铁电转变，发生在几个小时。所研究的体系为Pb（1−x）（Zr0.4Ti0.6）（1−x/4）O3 − xLa体系，其中掺杂了形成弛豫的La 3+。在0.09 < x ≤ 0.16的铁电/弛豫交叉成分范围内发生时间依赖的铁电转变。在这些组合物中，原位拉曼光谱和透射电子显微镜显示铁电相的生长非常缓慢。介电测量显示了转变的等温动力学。缓慢的铁电相变可以理解为由于La 3+引起的随机局部场导致极性纳米畴的快速生长减慢，因此需要长时间才能实现长程有序的宏观铁电相。
Ferroelectric transition involves tiny shift of ions within unit cell, thus being intrinsically a very fast process without apparent time-dependence. Contrary to this conventional wisdom, here we report a time-dependent ferroelectric transition, which occurs in hours. The system studied was Pb(1−x)(Zr0.4Ti0.6)(1−x/4)O3 − xLa system with relaxor-forming dopant La3+. The time-dependent ferroelectric transition occurs at the ferroelectric/relaxor crossover composition range of 0.09 < x ≤ 0.16. In these compositions, in situ Raman spectroscopy and transmission electron microscopy reveal very slow growth of ferroelectric phase. Dielectric measurement shows isothermal kinetics of the transition. The slow ferroelectric transition can be understood as being caused by the slowing-down of the otherwise fast growth of polar nano-domains due to the random local field caused by La3+, so that long time is needed to achieve long-range order macroscopic ferroelectric phase.