An assignment has been proposed for the internal vibrations of the MnO3- 4 ion, obtained from infrared and Raman spectra as well as from i. r. measurements of solid solutions of the type Ba3(PO4)2-x(MnO4)x and based on a factor group analysis of the Ba3(MnO4)2 lattice. A new set of force constants for the anion are also calculated from a modified valence force field.
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Baran et al. (1982) studied this question.
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