Adaptive ferroelectric states in systems with low domain wall energy: Tetragonal microdomains
Adaptive ferroelectric states in systems with low domain wall energy: Tetragonal microdomains
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DOI：
10.1063/1.1599632
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发表时间：
2003-09-01
影响因子：
3.2
通讯作者：
Viehland, D
中科院分区：
文献类型：
--
作者：
Jin, YM;Wang, YU;Viehland, D
具有非常低的畴壁能量的铁电和铁弹相已经被证明可以形成小型化的微畴结构。自适应铁电相的理论已经发展到预测的微区平均晶格参数的这种结构不均匀的状态。该理论是传统马氏体理论的延伸，适用于具有非常低的畴壁能量的铁电系统。被认为是铁电微畴的四面体对称的情况下。它示出了这样的情况下，纳米级的微畴的相干混合物可以被解释为自适应的铁电相，其微畴平均晶格是单斜的。该单斜相的晶格参数是自调节参数，其使相变应力最小化。自调整是通过对母相立方晶格施加不变的平面应变来实现的，自调整参数的值是母相和产物相的晶格常数的线性叠加。Pb（Mg_（1/3）Nb_（2/3））O_（3-）PbTiO_3和Pb（Zn_（1/3）Nb_（2/3））O_（3-）PbTiO_3单晶的实验研究证实了该理论的许多预言。(C)2003年，美国物理学会。
Ferroelectric and ferroelastic phases with very low domain wall energies have been shown to form miniaturized microdomain structures. A theory of an adaptive ferroelectric phase has been developed to predict the microdomain-averaged crystal lattice parameters of this structurally inhomogeneous state. The theory is an extension of conventional martensite theory, applied to ferroelectric systems with very low domain wall energies. The case of ferroelectric microdomains of tetragonal symmetry is considered. It is shown for such a case that a nanoscale coherent mixture of microdomains can be interpreted as an adaptive ferroelectric phase, whose microdomain-averaged crystal lattice is monoclinic. The crystal lattice parameters of this monoclinic phase are self-adjusting parameters, which minimize the transformation stress. Self-adjustment is achieved by application of the invariant plane strain to the parent cubic lattice, and the value of the self-adjusted parameters is a linear superposition of the lattice constants of the parent and product phases. Experimental investigations of Pb(Mg1/3Nb2/3)O-3-PbTiO3 and Pb(Zn1/3Nb2/3)O-3-PbTiO3 single crystals confirm many of the predictions of this theory. (C) 2003 American Institute of Physics.