St. Petersburg State Politekhnical University, St-Petersburg, Russia.
Phys Rev Lett. 2012 Aug 31;109(9):097603. doi: 10.1103/PhysRevLett.109.097603. Epub 2012 Aug 29.
Complementary diffuse and inelastic synchrotron x-ray scattering measurements of lead zirconate-titanate single crystals with composition near the morphotropic phase boundary (x=0.475) are reported. In the temperature range 293 K<T<400 K a highly anisotropic quasielastic diffuse scattering is observed. Above 400 K this scattering disappears. Its main features can be reproduced by the model of inhomogeneous lattice deformations caused by inclusions of a tetragonal phase into a rhombohedral or monoclinic phase. This observation supports the idea that PZT at its morphotropic phase boundary is essentially structurally inhomogeneous.
报道了近准同型相界（x=0.475）组成的锆钛酸铅单晶体的补充漫散射和非弹性同步辐射 X 射线散射测量。在 293 K<T<400 K 的温度范围内，观察到了各向异性的准弹性漫散射。高于 400 K 时，这种散射消失了。其主要特征可以通过包含四方相的菱形相或单斜相的不均匀晶格变形模型来重现。这一观察结果支持了在准同型相界处 PZT 本质上是结构不均匀的观点。
