Landau theory applied to phase transitions in calcium orthotungstate and isostructural compounds
arXiv:cond-mat/0611605 · doi:10.1209/0295-5075/77/56001
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.
14 pages, 3 figures