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The results of a factor group analysis, the symmetry coordinates and vibrational modes of the lattice vibrations of compounds crystallizing in NiAs structure respectively NiAs defect structure (Fe 3 Se 4  type) are presented. A normal coordinate treatment of the NiAs structure is performed using the GF-matrix-method assuming a valence force field with 3 force constants.

Gitterschwingungsspektren. XIV NiAs-und Fe 3 Se 4 -Struktur / Lattice Vibration Spectra. XIV. NiAs and Fe3Se4 Structure