Structural phase transitions of RbCaF3
- 1 September 1985
- journal article
- research article
- Published by Taylor & Francis in Phase Transitions
- Vol. 5 (3) , 219-232
- https://doi.org/10.1080/01411598508209320
Abstract
Specific heat measurements, dielectric measurements and X-ray diffraction of RbCaF3 show two first-order transitions at 193 K and 41 K. Structural information about these transitions has been obtained using energy-dispersive X-ray diffraction. It was found that successive transitions are Oh 1(Pm3m) → D4h 18(14/mcm) → D2h 13(Pmmn) on cooling. These results were interpreted by successive condensation of an R25 z and an M3 x + y soft phonon mode from the ideal cubic phase.Keywords
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