Anharmonic effects on lattice vibration modes of sillenites

被引：8

作者：

Beneventi, P ^{[1
]}

Capelletti, R ^{[1
]}

Kovacs, L ^{[1
]}

机构：

[1] HUNGARIAN ACAD SCI,CRYSTAL PHYS RES LAB,H-1112 BUDAPEST,HUNGARY

来源：

RADIATION EFFECTS AND DEFECTS IN SOLIDS | 1995年 / 134卷 / 1-4期

关键词：

vibrational modes; FTIR spectroscopy; sillenites; multi-phonon transitions;

D O I：

10.1080/10420159508227233

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

High resolution FTIR absorption spectroscopy in the 600-3500 cm(-1) wavenumber and 9-300 K temperature ranges was applied to study multi-phonon transitions of the tetrahedral unit modes in BSO, EGO, BTO and mixed BSO-BGO sillenite crystals. Up to four-phonon (overtones of the F mode and combination of F and A modes) transitions were detected in EGO, BSO, and BTO and up to three- in the mixed crystals. The F mode anharmonicity, evaluated in the framework of the Morse oscillator model, was in the range 0.0024-0.0056. Fine structures due to Si-isotopes were observed in BSO. The two- and three-phonon transitions in the mixed crystals were well described by a two-mode behaviour.

引用

页码：293 / 297

页数：5

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