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Soft-mode Raman spectra in K1−xLixTa1−yNbyO3

Authors :
P. P. Syrnikov
P. Camagni
Giorgio Samoggia
Pietro Galinetto
E. Giulotto
V. A. Trepakov
Source :
Ferroelectrics. 254:135-142
Publication Year :
2001
Publisher :
Informa UK Limited, 2001.

Abstract

Raman observations in the region of the TO 1 soft mode were performed on samples of K 1-x Li x Ta 1-y Nb y O 3 , having x in the range 0.6 - 1.0 % mol. and y in the range 0.2 - 0.3 % mol. The analysis of temperature evolution and spectral shape allowed to evidence the spontaneous splitting of the TO 1 mode and its relative stiffness below 50 K, accompanied by an abrupt increase of first order scattering strengths. Such effects are not observed when Li or Nb are separately introduced in the KTaO 3 matrix, at the given concentrations.

Details

ISSN :
15635112 and 00150193
Volume :
254
Database :
OpenAIRE
Journal :
Ferroelectrics
Accession number :
edsair.doi...........9464775bf5e18e39b50a4b640a282739
Full Text :
https://doi.org/10.1080/00150190108214994