Journal
VIBRATIONAL SPECTROSCOPY
Volume 46, Issue 2, Pages 100-106Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.vibspec.2007.11.002
Keywords
Raman scattering; nonlinear crystals; RECOB
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The phonon modes of the rare-earth calcium oxyborates [RECa(4)O(BO(3))(3), RE = La and Gd] were determined at room-temperature using Raman scattering technique. The observed frequencies were assigned on the basis of the borate (BO(3)) vibrations and correlations with previous data reported for other similar compounds. The influence of the RE ion substitution on the phonon distribution is discussed. Two main features were observed when La(3+) replaces for Gd(3+): the frequency of most of the phonons shifts downwards and the frequency difference between the components of the nu(1)(BO(3)) doublet decreases. All these features result from the monoclinic lattice expansion. (C) 2007 Elsevier B.V. All rights reserved.
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