Title: Preparation of a new tungsten(V) phosphate and its polymorph
Abstract: Under reducing conditions, WOPO4 crystallizes with a monoclinic cell of a = 11.172(8), b = 5.217(1), c = 6.543(2), Å, and β = 90.34(4)°. It is the second member of the monophosphate tungsten bronzes, (PO2)4(WO3)2m. A tetragonal form of this compound was prepared at 900°C and 6 GPa using the monoclinic form as a starting material; lattice constants are a = 6.250(1) and c = 4.066(1), Å. The volume reduction on transformation is 16.7%. Both forms of WOPO4 are paramagnetic in the temperature range 80 to 500 K, having effective magnetic moments of 1.6 μb for the monoclinic form and 1.5 μB for the tetragonal form. Electric resistivity of the monoclinic form measured on pressed pellet was 0.11 Ω m at room temperature with an activation energy of 8.6 × 10−2 eV, while that of the tetragonal form was >3 × 103 Ω m.
Publication Year: 1988
Publication Date: 1988-11-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 17
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