Lattice dynamics of cubic PbTiO3 by inelastic neutron scattering

被引：22

作者：

Kempa, M.

Hlinka, J.

Kulda, J.

Bourges, P.

Kania, A.

Petzelt, J.

机构：

[1] Acad Sci Czech Republ, Inst Phys, Prague 18221 8, Czech Republic

[2] Charles Univ, Fac Math & Phys, CR-12116 Prague 2, Czech Republic

[3] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France

[4] CEA, CNRS, Lab Leon Brillouin, F-91191 Gif Sur Yvette, France

[5] Silesian Univ, Inst Phys, PL-40007 Katowice, Poland

来源：

PHASE TRANSITIONS | 2006年 / 79卷 / 6-7期

关键词：

relaxor ferroelectrics; lattice dynamics; soft mode;

D O I：

10.1080/01411590600892021

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

High-temperature dispersion relations of the phonon modes in a cubic PbTiO3 single crystal have been investigated along the [xi 0 0] and [xi xi 0] directions by inelastic neutron scattering. Above T-c, the phonon dispersions are only temperature-dependent close to the Brillouin zone centre where the mode softening comes through. The measurements indicate large cubic anisotropy of the elastic tensor and relatively low anisotropy of the soft mode dispersion. The differences from an earlier inelastic neutron scattering study are discussed.

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收藏

页码：351 / 359

页数：9

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