Abstract
Infrared and Raman spectra on powder samples of K 3Sb 3P 2O 14,xH 2O and K 3Sb 3As 2O 14,xH 2O and polarized Raman spectra on a single crystal of K 3Sb 3P 2O 14,xH 2O have been recorded. A normal coordinate analysis using a generalized valence force field has been performed. All the normal modes of vibration are described in terms of potential energy distribution. The validity of the force field and the values of the force constants are discussed.
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