Nonlinear stress-strain behavior and stress-induced phase transitions in soft Pb(Zr1−xTix)O3at the morphotropic phase boundary
Nonlinear stress-strain behavior and stress-induced phase transitions in soft Pb(Zr1−xTix)O3at the morphotropic phase boundary
复制标题
DOI：
10.1103/physrevb.87.094116
复制
发表时间：
2013-03
影响因子：
3.7
通讯作者：
Yo-Han Seo;D. J. Franzbach;J. Koruza;A. Benčan;B. Malič;M. Kosec;Jacob L. Jones;K. Webber
中科院分区：
文献类型：
--
作者：
Yo-Han Seo;D. J. Franzbach;J. Koruza;A. Benčan;B. Malič;M. Kosec;Jacob L. Jones;K. Webber
在25 ° C至400 °C之间表征了各种软Pb0.98Ba0.01（Zr 1 −xTix）0.98Nb0.02O3（0.40≤x≤0.60）组合物的温度依赖性应力-应变行为，以确定晶体结构对铁弹性的影响。铁弹响应被发现显着依赖于晶相以及自发应变，这两者都随温度而变化。菱面体材料的回复应变高于晶体自发应变所允许的理论最大值。这种观察到的行为表明，在机械压缩过程中，除了铁弹性的滞后过程的存在。一个唯象的自由能分析被用来预测应力对铁电体中稳定相的影响，并表明应力诱导相变的菱面体和四面体结构的敏感性。模拟结果表明，这种相变的宏观应力-应变行为的相对重要性，提供了一个间接的方法来观察场致相变的多晶铁电体。
Temperature-dependent stress-strain behavior of various soft Pb0.98Ba0.01(Zr1−xTix)0.98Nb0.02O3, 0.40≤x≤0.60, compositions was characterized between 25 and 400 °C to determine the influence of crystal structure on ferroelasticity. The ferroelastic response was found to depend significantly on the crystal phase as well as the spontaneous strain, both of which varied with temperature. The remanent strain for rhombohedral materials was shown to be above the theoretical maximum allowed by the crystal spontaneous strain. This observed behavior indicates the presence of hysteretic processes in addition to ferroelasticity during mechanical compression. A phenomenological free energy analysis was used to predict the effects of stress on the stable phase in ferroelectrics and indicates the susceptibility of the rhombohedral and tetragonal structure to a stress-induced phase transition. Modeling results indicate the relative importance of such phase transitions on macroscopic stress-strain behavior, giving an indirect method to observe field-induced phase transitions in polycrystalline ferroelectrics.