Abstract
Vibrations induced by potassium ions in potassium beta alumina give rise to absorption bands at 2K which occur at 29 and 88 cm-1 and also in the region 145-175 cm-1. These bands show effects of anharmonicity with increasing temperature. At 600K the 29 cm-1 band has almost totally disappeared and is partly replaced by a diffusive component to the absorption. This component has been measured at energies down to 2 cm-1. A simple phenomenological model reproduces temperature-induced changes in the spectrum reasonably well.
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