Landau theory applied to phase transitions in calcium orthotungstate and isostructural compounds

Abstract

The pressure-driven tetragonal-to-monoclinic phase transition in CaWO4 and related scheelite-structured orthotungstates is analysed in terms of spontaneous strains. Based upon our previous high-pressure x-ray diffraction results and the Landau theory, it is suggested that the scheelite-to-fergusonite transition is of second order in nature.

arXiv comment14 pages, 3 figures

References in corpus (5)

• High-pressure structural study of the scheelite tungstates CaWO4 and SrWO4
• Determination of the high-pressure crystal structure of BaWO4 and PbWO4
• Effects of pressure on the local atomic structure of CaWO4 and YLiF4: Mechanism of the scheelite-to-wolframite and scheelite-to-fergusonite transitions
• Effects of high pressure on the optical absorption spectrum of scintillating PbWO4 crystals
• High Pressure phase transitions in BaWO4

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• High-pressure x-ray diffraction study of SrMoO4 and pressure-induced structural changes
• Combined Raman scattering and ab initio investigation of pressure-induced structural phase transitions in the scintillator ZnWO4
• High-pressure structural investigation of several zircon-type orthovanadates
• In situ high-pressure synchrotron x-ray diffraction study of CeVO4 and TbVO4 up to 50 GPa
• Zircon to monazite phase transition in CeVO4
• High-pressure structural behaviour of HoVO4: Combined XRD experiments and ab initio calculations
• High-pressure powder x-ray diffraction study of EuVO4
• High pressure crystal structures of orthovanadates and their properties
• Experimental and theoretical investigations on ThGeO4 at high pressure
• High-pressure high-temperature phase diagram of zinc
• High-pressure x-ray diffraction study of bulk and nanocrystalline PbMoO4
• The high-pressure behavior of CaMoO4
• High-Pressure Monoclinic-Monoclinic Transition in Fergusonite-type HoNbO4
• Application of Finite Strain Landau Theory To High Pressure Phase Transitions
• High-Pressure X-Ray Diffraction Study of Scheelite-type Perrhenates