J. Phys. IV France 11 (2001) Pr10-57-Pr10-62
High-pressure study of microcrystalline tungsten trioxide phase transitions by Raman spectroscopyM. Boulova1, 2, G. Lucazeau1, T. Pagnier1 and A. Gaskov2
1 LEPMI, CNRS INPG, 1130 rue de la Piscine, BP. 75, 38402 Saint-Martin-d'Hères cedex, France
2 Chemistry Department, Moscow State University, Moscow 119899, Russia
A high-pressure Raman study of microcrystalline tungsten oxide was performed in the 0.1 MPa-31 GPa pressure range under isostatic and non-isostatic conditions. The phase transitions, which take place below 0.1 GPa and at 22 GPa are first order, while two further structural changes, observed at about 3 and 10 GPa, are diffuse. Surprisingly, the non-isostatic conditions do not induce inhomogeneous band broadenings and do not modify the transitions sequence observed in isostatic conditions. Compressibility of the different phases is estimated from spectral data.
© EDP Sciences 2001