THE PHONON-DISPERSION AND LATTICE-DYNAMICS OF ALPHA-ALPO4 - AN INELASTIC NEUTRON-SCATTERING STUDY

被引：11

作者：

BETHKE, J ^{[1
]}

ECKOLD, G ^{[1
]}

HAHN, T ^{[1
]}

机构：

[1] FORSCHUNGSZENTRUM JULICH, INST FESTKORPERFORSCH, W-5170 JULICH 1, GERMANY

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1992年 / 4卷 / 25期

关键词：

D O I：

10.1088/0953-8984/4/25/007

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The low-energy part of the phonon dispersion of the quartz isotype alpha-AlPO4 has been investigated by inelastic neutron scattering. The experimental data are reproduced by different lattice dynamical models. Good quantitative agreement with experimental neutron, Raman and infrared data is achieved even with just a simple five-parameter Born-von Karman model. The results are compared with the lattice dynamics of quartz. As a main result, it is found that the lattice dynamics at low frequencies is essentially determined by the properties of the oxygen framework, irrespective of the specific nature of the central atoms within the oxygen tetrahedra. The dynamical stability of the lattice is discussed with regard to the incommensurate phase transition.

引用

页码：5537 / 5550

页数：14

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