Landau theory applied to phase transitions in calcium orthotungstate and isostructural compoundsD. Errandonea
Departamento de Física Aplicada-ICMUV, Universitat de València - Edificio de Investigación, c/Dr. Moliner 50, 46100 Burjassot (Valencia), Spain
received 23 November 2006; accepted in final form 3 January 2007; published March 2007
published online 15 February 2007
The pressure-driven tetragonal-to-monoclinic phase transition in 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.
61.50.Ks - Crystallographic aspects of phase transformations; pressure effects.
62.50.+p - High-pressure and shock wave effects in solids and liquids.
64.70.Kb - Solid-solid transitions.
© Europhysics Letters Association 2007