Influence of the cationic substitution on the mechanism of structural phase transitions in RbCaF₃ and KCaF₃: Study of a typical mixed crystal Rb_0.68K_0.32CaF₃

Ph. Daniel Laboratoire de Physique de Etat Condensé,, UPRES A associée au CNRS 6087, Université du Maine, avenue O. Messiaen, 72085, Le Mans Cedex 9, France

J. Toulouse Physics Department, Lehigh University, 16 Memorial Drive East, Bethlehem, Pennsylvania, 18015, USA

M. Rousseau Laboratoire de Physique de Etat Condensé,, UPRES A associée au CNRS 6087, Université du Maine, avenue O. Messiaen, 72085, Le Mans Cedex 9, France

A. Désert Laboratoire de Physique de Etat Condensé,, UPRES A associée au CNRS 6087, Université du Maine, avenue O. Messiaen, 72085, Le Mans Cedex 9, France

A. Ratuszna Institute of Physics, university of Silesia, Uniwersytecka 4, 40-007, Katowice, Poland

Abstract

A full investigation of structural instabilities in the mixed perovskite crystal Rb_0.68K_0.32CaF₃ was performed by optical birefringence, X-ray diffraction and Raman scattering. A sequence for the phase transitions, according to the Glazer formalism, is proposed in agreement with that occurring in both the pure crystals RbCaF₃ and KCaF₃. Raman spectra are interpreted using group theory analysis and discussed in the framework of a classical Landau behaviour. With this work, the unusual phase transition mechanism observed for the perovskite KCaF₃ appears accessible to experiment and is then studied in detail.

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Influence of the cationic substitution on the mechanism of structural phase transitions in RbCaF₃ and KCaF₃: Study of a typical mixed crystal Rb_0.68K_0.32CaF₃

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Influence of the cationic substitution on the mechanism of structural phase transitions in RbCaF3 and KCaF3: Study of a typical mixed crystal Rb0.68K0.32CaF3

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Influence of the cationic substitution on the mechanism of structural phase transitions in RbCaF₃ and KCaF₃: Study of a typical mixed crystal Rb_0.68K_0.32CaF₃