Normal coordinate analysis of potassium and rubidium fluoaluminates

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Abstract
Infrared absorption spectra of alkali fluoaluminate crystals MAlF4 (M: K and Rb) have been measured in the frequency region from 4000–30 cm−1. Both the intramolecular vibrations such as the Al–F bond stretching and the F–Al–F bending vibrations and the lattice vibrations due to the interaction between the inner complex and the outer ions have been observed in the frequency regions of 800–160 cm−1 and below 160 cm−1, respectively. A normal coordinate analysis of the crystal as a whole has been carried out on the basis of a simple valence force field. The force constants of the Al–F stretching, F–Al–F bending, and M · · · F interaction have been obtained and discussed in relation to the interatomic distances. It has also been found that the simple valence force field assumed here is adequate for these complex fluorides.

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