The observation that the baryte structure [Pnma(D162h)] results from a distortion of a structure with lower unit cell occupancy [Imma(D282h)] provides, for compounds crystallising with this lattice, a symmetry-based model for the assignment of the lattice vibrations at k= 0 in which relative band intensities are used as assignment criteria.
U. A. Jayasooriya, S. F. A. Kettle, S. Mahasuverachai and R. P. White, J. Chem. Soc., Faraday Trans., 1996, 92, 3625 DOI: 10.1039/FT9969203625
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