时效和退火对PZT反铁电转变极性和反铁畸变成分的影响
Effects of aging and annealing on the polar and antiferrodistortive components of the antiferroelectric transition in PZT
摘要：
反极性和antiferrodistortive（AFD）组件的反铁电（AFE）在PbZr 1-xTixO 3（x=0.054）的转变可以单独发生，并具有不同的动力学，这取决于样品的历史，并伴随着弹性软化和硬化，分别。连同软化，伴随着八面体倾斜的一部分相，尚未转化为AFE，它们引起的各种形状的曲线的弹性顺应性与温度。在x=0.046和0.054的样品中发现的所有这些异常，除了那些已经在x=0.050的研究，可以符合一致的唯象模型的基础上的简单假设，每个极性和AFD转换产生一个步骤的弹性模量，其位置在温度和宽度反映了每个过渡的进展。转变的动力学的减慢与在铁电或AFE状态下老化期间缺陷结构的形成相关，这也是晶格随时间和热循环逐渐软化的原因，直到在高温下退火恢复初始条件。
英文摘要：
The antipolar and antiferrodistortive (AFD) components of the antiferroelectric (AFE) transition in PbZr1-xTixO3 (x=0.054) can occur separately and with different kinetics, depending on the sample history, and are accompanied by elastic softening and stiffening, respectively. Together with the softening that accompanies octahedral tilting in the fraction of phase that is not yet transformed into AFE, they give rise to a variety of shapes of the curves of the elastic compliance versus temperature. All such anomalies found in samples with x=0.046 and 0.054, in addition to those already studied at x=0.050, can be fitted consistently with a phenomenological model based on the simple hypothesis that each of the polar and AFD transitions produces a step in the elastic modulus, whose position in temperature and width reflect the progress of each transition. The slowing of the kinetics of the transformations is correlated with the formation of defect structures during aging in the ferroelectric or AFE state, which are also responsible for a progressive softening of the lattice with time and thermal cycling, until annealing at high temperature recovers the initial conditions.
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