The temperature dependence of the structures of RbCaF3, and the determination of the low temperature phasesReport as inadecuate




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Abstract : The temperature dependence of the structural parameters ions coordinates and ions temperature factors in the vicinity of the cubic to tetragonal structural phase transition of RbCaF3 at 193 K is reported together with the structure of this compound below 50 K. The neutron powder profile refinement method has been used to carry out this study. The same space group Pnma-D162h has been found at 20 K and 4.5 K. Equality of the CaF6 tilt angles about each of the three < 100 cubic axes in the low temperature phase and the behaviour of the temperature factors in the cubic and tetragonal phases indicate an order-disorder character of the 193 K and 50 K phase transitions.

Keywords : crystal atomic structure of inorganic compounds displacive transformations neutron diffraction examination of materials order disorder transformations rubidium compounds





Author: A. Bulou C. Ridou M. Rousseau J. Nouet A.W. Hewat

Source: https://hal.archives-ouvertes.fr/



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