Temperature-dependent Raman scattering studies in NaNbO3 ceramics

被引：62

作者：

Lima, RJC

Freire, PTC

Sasaki, JM

Ayala, AP

Melo, FEA

Mendes, J

Serra, KC

Lanfredi, S

Lente, MH

Eiras, JA

机构：

[1] Univ Fed Ceara, Dept Fis, BR-60455760 Fortaleza, Ceara, Brazil

[2] Univ Fed Alagoas, Dept Fis, BR-57072970 Maceio, AL, Brazil

[3] Univ Sao Paulo, Inst Fis, BR-13560970 Sao Carlos, SP, Brazil

[4] Univ Fed Sao Carlos, Dept Fis, BR-13560970 Sao Carlos, SP, Brazil

来源：

JOURNAL OF RAMAN SPECTROSCOPY | 2002年 / 33卷 / 08期

关键词：

D O I：

10.1002/jrs.897

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

Raman spectra of sintered NaNbO3 ceramics prepared by a new chemical route were obtained for temperatures between 15 and 297 K. From analysis of the results and dielectric permittivity measurements, we observed that the ceramic undergoes two diffuse phase transitions. The first phase transition was observed between 240 and 300 K and the second between 40 and 70 K. Also, analysis of band linewidths points to an orientational mechanism dominating the peak damping and a weak contribution of the anharmonic effect, in contrast to previous results obtained at high temperature. Copyright (C) 2002 John Wiley Sons, Ltd.

引用

页码：669 / 674

页数：6

共 30 条

[1] TEMPERATURE DEPENDENCE OF RAMAN CROSS-SECTIONS IN BATIO3 AND SRTIO3 [J].