Raman investigation on (Ta2O5)1-x(TiO2)x system at different temperatures and pressures

被引：19

作者：

Meng, JF ^{[1
]}

Rai, BK

Katiyar, RS

Bhalla, AS

机构：

[1] Univ Puerto Rico, Dept Phys, San Juan, PR 00931 USA

[2] Penn State Univ, Mat Res Lab, University Pk, PA 16802 USA

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 1997年 / 58卷 / 10期

关键词：

Raman spectra; (Ta2O5)(1-x)(TiO2)(x); phase transition; high pressure;

D O I：

10.1016/S0022-3697(97)00180-7

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Micro Raman spectra for (Ta2O5)(1-x)(TiO2)(x) reveal an induced Raman enhancement of the low frequency phonon modes for a critical TiO2 content, x = 0.08. The temperature and pressure effects on these modes have also been studied. The Raman enhancement is shown to be associated with effects of the superstructure which is composed of TiO6 octahedra and Ta-O clusters. Pressure Raman scattering on (Ta2O5)(0.92)(TiO2)(0.08) indicates that a phase transition occurs at similar to 6.22 Gpa. Based on our Raman scattering studies, the origin responsible for the enhanced dielectric constant in samples with TiO2, content, x = 0.08, has been provided and discussed. (C) 1997 Elsevier Science Ltd.

引用

页码：1503 / 1506

页数：4

共 18 条

[1] SOFT MODE BEHAVIOR IN PBTI1-XZRXO3 [J].