Abstract
Infrared spectra were determined for a series of oxides related by ordering and distortion to the rock-salt structure. The expected spectrum of the tetragonal 1:1 ordering (space group D4h19) contains 5 ir-active and 8 Raman-active bands. For the trigonally distorted structure (space group D3d5) factor group calculations yield 4 ir and 2 Raman modes. The expected additional structure appears in the spectra of the tetragonal materials but is broadened and washed out by the long-range polarization field. The spectra of the trigonal materials contain twice the predicted number of modes. The broadened bands of the 6-coordinated structures are compared with the sharp spectra of 4-coordinated γ-LiAlO2.
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