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Type: Artigo de periódico
Title: Pressure Dependence Of The Raman Modes Of Liio3
Author: Lemos V.
Melo F.E.A.
Cerdeira F.
Abstract: The pressure dependence of the Raman modes of LiIO3 at room temperature was studied up to 78 kbar in a gasketed sapphire-anvil cell. Nonlinear frequency increases were observed in all modes involving translation of the light Li+ atom. This behavior is more marked in the lowest frequency A mode, which involves translations along the c-axis. Other modes slow smaller linear frequency increases, with increasing pressure. The TO-LO splittings of all but the highest frequency modes are seen to be independent of pressure. This indicates that charge transfer between ions is negligible. For modes derived from internal vibrations of IO3 - ions an increase in this splitting with increasing pressure is observed, indicating some intra-ion redistribution of charge. Mode Grüneissen parameters are obtained for representative modes of all allowed symmetries in each of the three frequency ranges in which the Raman spectrum of the material can be divided. © 1981.
Rights: fechado
Identifier DOI: 10.1016/0038-1098(81)90246-5
Date Issue: 1981
Appears in Collections:Unicamp - Artigos e Outros Documentos

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