期刊
JOURNAL OF RAMAN SPECTROSCOPY
卷 41, 期 6, 页码 698-701出版社
WILEY-BLACKWELL
DOI: 10.1002/jrs.2496
关键词
perovskites; Raman spectroscopy; infrared; sodium bismuthate; crystal structure
类别
资金
- CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico)
- FINEP (Agencia de Inovacao)
- FAPEMIG (Fundacao de Amparo a Pesquisa do Estado de Minas Gerais)
NaBiO3 is an ilmenite-type compound presenting a trigonal structure. In this work, we have performed optical spectroscopic investigations using Raman scattering and infrared reflectivity for this material. By using group-theory calculations, it was possible to determine the number of optically active modes. Fitting procedures besides Kramers-Kronig (KK) procedures lead to a consistent collection of phonon modes. The Raman spectrum showed nine active first-order modes, while the infrared one revealed eight polar phonons, in good agreement with the theoretical predictions. The results allowed us to confirm the R (3) over bar (#148) space group for this compound, and to establish a set of active phonons not yet reported in the literature. Copyright (C) 2009 John Wiley & Sons, Ltd.
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