Phases and phase transitions of KPF₆

P. Huber Fachbereich Physik, Universität des Saarlande, D 66041, Saarbrücken, Germany

H. Krummeck Fachbereich Physik, Universität des Saarlande, D 66041, Saarbrücken, Germany

J. Baller Fachbereich Physik, Universität des Saarlande, D 66041, Saarbrücken, Germany

J. K. Krüger Fachbereich Physik, Universität des Saarlande, D 66041, Saarbrücken, Germany

K. Knorr Fachbereich Physik, Universität des Saarlande, D 66041, Saarbrücken, Germany

S. Haussühl Institut für Kristallographie, Universität zu Köln, Köln, Germany

Abstract

Potassium hexafluorophosphate KPF₆ has been investigated by X-ray powder diffraction, calorimetry and Brillouin spectroscopy. With decreasing temperature, the crystal shows a sequence of phases: NaCl-type cubic-monoclinic-monoclinic with two-phase coexistence regions in between. In the cubic phase the elastic constants have been determined. c ₄₄ and c ₁₂ show a slight softening.

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Phases and phase transitions of KPF₆