POLARIZATION DEPENDENCE OF THE 1ST-ORDER RAMAN-SPECTRUM OF ALPHA-ALPO4

被引：12

作者：

GOULLET, A

PASCUAL, J

CUSCO, R

CAMASSEL, J

机构：

[1] UNIV AUTONOMA BARCELONA,INST CIENCIA MAT BARCELONA,E-08193 BARCELONA,SPAIN

[2] UNIV AUTONOMA BARCELONA,DEPT FIS,E-08193 BARCELONA,SPAIN

来源：

PHYSICAL REVIEW B | 1991年 / 44卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.44.9936

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Investigating in great detail the polarization dependence of the first-order Raman spectrum of alpha-AlPO4 (berlinite), we discuss the experimental results in terms of first-order (quartzlike) and folded-zone frequencies. We identify all Raman-active modes predicted by group-theory arguments and find, in many cases, a small renormalization of experimental values through the isoelectronic sequence beta-SiO2, alpha-SiO2, alpha-AlPO4. This demonstrates a strong molecular character which is well accounted for by a simple model calculation in which one links, progressively, three decoupled SiO4 tetrahedra to build a quartzlike unit cell.

引用

页码：9936 / 9943

页数：8

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