Abstract
A high-pressure Raman study of microcrystalline tungsten oxidewas performed in the 0.1 MPa-30 GPa pressure range underhydrostatic and non-hydrostatic conditions. Two phasetransitions are evidenced; they take place below 0.1 GPa and atabout 22 GPa and are of first order. Two spectral anomalies are observed at about 3 and 10 GPa; they may be related to diffuseweak structural transitions. The number of observed Raman bandsremains practically unchanged in the 0.1-30 GPa range and thusthe symmetry changes are likely to be small. Surprisingly, thenon-hydrostatic conditions do not induce inhomogeneous bandbroadening and do not modify the transition sequence observedin hydrostatic conditions. The compressibilities of the different observed phases are estimated from spectral data anddiscussed within Hazen's polyhedral approach.
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