Temperature dependence of the Raman modes in LiNbO3 and mechanism of the phase transition

被引：54

作者：

Ridah, A

Fontana, MD

Bourson, P

机构：

[1] SUPELEC,F-57078 METZ 3,FRANCE

[2] UNIV HASSAN 2,FAC SCI,LAB PHYS SOLIDE,CASABLANCA,MOROCCO

来源：

PHYSICAL REVIEW B | 1997年 / 56卷 / 10期

关键词：

D O I：

10.1103/PhysRevB.56.5967

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have performed Raman-scattering measurements on LiNbO3 as a function of temperature. In the configuration (ZZ) both a soft phonon A(1) (TO) and a quasielastic scattering have been observed and carefully analyzed within a model including a decoupled damped oscillator and a Debye relaxation mode. Good agreement was achieved in the dielectric constant between the calculated values deduced from Raman studies and the experimental data reported by Tomeno and Matsumara. This agreement proves the validity of our fitted phonon parameters and supports the mainly order-disorder character for the ferroelectric-paraelectric phase transition of LiNbO3.

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页码：5967 / 5973

页数：7

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