Lattice vibrations in compounds crystallising with the baryte structure
Abstract
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.