Micro-Brillouin scattering and central peaks of 0.91Pb(Zn1/3 Nb2/3)-0.09PbTiO3 single crystals

被引：14

作者：

Jiang, FM ^{[1
]}

Kojima, S ^{[1
]}

机构：

[1] Univ Tsukuba, Inst Mat Sci, Tsukuba, Ibaraki 3058573, Japan

来源：

FERROELECTRICS | 2002年 / 266卷

关键词：

Brillouin scattering; central peak; relaxor ferroelectric; lead zinc niobate; elastic constant; sound velocity;

D O I：

10.1080/00150190211453

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Central peaks and acoustic phonons of 0.91Pb(Zn1/3Nb2/3)-0.09PbTiO(3) (0.91PZN-0.09PT) relaxor single crystals have been studied in detail by a micro-Brillouin scattering technique. Two phase transitions from cubic to tetragonal and tetragonal to rhombohedral upon cooling are observed through the frequency shifts and damping of the acoustic phonons. 0.91PZN-0.09PT near morphotropic phase boundary is heterogeneous, and the heterogeneity is studied by scanning the incident laser spot over the crystal sample. Elastic constant c(33) and sound velocity v(LA) are determined. Central peaks have been directly observed, they show marked temperature dependence both in intensity and width; they are closely related to the fluctuations of polar microregions. Relaxation times are obtained and the mechanisms of central peaks are discussed.

引用

页码：19 / 26

页数：8

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