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Article Dans Une Revue Journal of Physics: Condensed Matter Année : 2002

X-ray diffraction study of WO3 at high pressure

Résumé

The high-pressure behaviour of microcrystalline tungsten oxide (WO3) has been investigated with angle-dispersive synchrotron x-ray powder diffraction in a diamond anvil cell up to 40 GPa at room temperature. Up to 21 GPa, the pressure dependence of the volume of the monoclinic high-pressure (P21/c) phase is described by a third-order Birch–Murnaghan equation of state with parameters V0 = 210.9(7)Å3, KT = 27(2)GP a and K' = 9.4(5). At 24 GPa, a first-order phase transition occurs with an approximate ΔV of 7.4% to a monoclinic P21/a unit cell with a = 6.1669(8)Å, b = 4.5758(6)Å, c = 5.3159(6)Å, β = 101.440(9)ˆ. A second transition is observed at pressures higher than 31 GPa with an approximate ΔV of 12% to a phase described by a third monoclinic unit cell, with a = 10.3633(22)Å, b = 3.9065(8)Å, c = 9.3459(18)Å and β = 98.539(14)ˆ

Domaines

Matériaux
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Dates et versions

hal-00418160 , version 1 (17-09-2009)

Identifiants

Citer

Pierre Bouvier, Wilson A. Crichton, Marina Boulova, Guy Lucazeau. X-ray diffraction study of WO3 at high pressure. Journal of Physics: Condensed Matter, 2002, 14 (26), pp. 6605-6617. ⟨10.1088/0953-8984/14/26/301⟩. ⟨hal-00418160⟩
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