Volume effects on the Raman frequencies of phosphate ions in fluorapatite crystals

被引：8

作者：

Bonner, CE ^{[1
]}

Chess, CC ^{[1
]}

Meegoda, C ^{[1
]}

Stefanos, S ^{[1
]}

Loutts, GB ^{[1
]}

机构：

[1] Norfolk State Univ, Mat Res Ctr, Norfolk, VA 23504 USA

来源：

OPTICAL MATERIALS | 2004年 / 26卷 / 01期

基金：

美国国家科学基金会;

关键词：

fluorapatite; crystal field; phosphate vibrations;

D O I：

10.1016/j.optmat.2003.12.003

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The vibrations of phosphate (PO4-3) ions in single crystals of hexagonal Ba-5(PO4)(3)F (B-FAP) have been investigated by means of polarized Raman scattering and compared to Raman frequencies observed in fluorapatite analogs Sr-5(PO4)(3)F (S-FAP) and Ca-5(PO4)(3)F (FAP). The Raman vibrational frequencies decrease upon substitution of Ba2+ for Sr2+ or Ca2+ in the lattice, asymtotically approaching the Raman frequencies for vibrations of the free ion. The observed splitting is in accord with predictions made by a group theory analysis of the factor group of the unit cell. The effects of the host lattice environment on the magnitude of the Davydov splittings and frequency shifts of phosphate ions within different crystals with the fluorapatite structure are demonstrated to be inversely proportional to the unit cell volume. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：17 / 22

页数：6

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