Mixed valence tungsten oxides with a tunnel structure,P4W4nO12n+8: A nonintegral member P4W10O38 (n = 2.5) |
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Authors: | A. Benmoussa Ph. Labbe D. Groult B. Raveau |
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Affiliation: | Laboratoire de Cristallographie, Physique et Chimie du Solide, L.A. 251, ISMRA, Université de Caen, 14032 Caen Cedex, France |
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Abstract: | The mixed-valence oxide P4W10O38, which can be considered as the nonintegral member n = 2.5 of the series P4W4nO12n+8, crystallizes in the monoclinic system with unit-cell dimensions a = 6.5656(25), b = 5.2850(15), c = 20.573(15) Å, β = 96.18(4)°, and space group P21. The crystal structure was solved by conventional Patterson and Fourier techniques using 2339 counter-measured reflections that obeyed the condition I > 3σ(I) and refined to an R factor of 0.074 (Rw = 0.077). Basically, the framework of the structure built up from ReO3-type slabs connected through PO4 tetrahedra looks like that of P4W8O32 previously described. Unlike P4W8O32, two successive ReO3-type slabs have a different width corresponding to two and three WO6 octahedra so that the structure can be considered as an intergrowth of the integral members n = 2 and n = 3 of the series P4W4nO12n+8. |
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