Abstract
The temperature dependence of the infrared reflectivity spectra of potassium nitrate is reported over a wide temperature range: 80 to 473 K, in phase II and phase I. The reflectivity spectra are fitted to the factorised form of the dielectric function including a relaxation mode. The temperature dependence of the lattice mode parameters is reported in the two phases. The ionic effective charges are calculated from the TO-LO splitting of the polar optical modes. The activity of a relaxation mode is consistent with the order-disorder nature of the phase transition between two para-electric phases.
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