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An X-Ray and Electron Diffraction Study of the Intergrowth Tungsten Bronze Sb0.16WO3

✍ Scribed by S.T. Triantafyllou; P.C. Christidis; Ch.B. Lioutas

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
618 KB
Volume
134
Category
Article
ISSN
0022-4596

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✦ Synopsis

The average structure of the orthorhombic antimony tungsten bronze, Sb 0.16 WO 3 , has been resolved by three-dimensional single-crystal X-ray diffraction (space group Pmmm, a av ‫؍‬ 7.4261(7), b av ‫؍‬ 10.2004(15), c av ‫؍‬ 3.8061(7) A s , and Z ‫؍‬ 5). The structure refinement based on 377 observed unique reflections with I > 2 (I ) (3493 totally measured reflections) converged to R ‫؍‬ 0.064. The structure is of the intergrowth tungsten bronze type (ITB), consisting of slabs of hexagonal tungsten bronze structure (HTB) interchanged with slabs of perovskite-like WO 3 structure (PTB) along [010]. The HTB slabs are one hexagonal tunnel thick and the PTB slabs are two WO 6 octahedra thick. The Sb atoms are distributed over two positions inside the hexagonal tunnels. Electron diffraction observations revealed a superstructure with a s ‫؍‬ 2a av , b s ‫؍‬ 2b av , and c s ‫؍‬ 4c av , which may be attributed to an ordering of the Sb atoms. A possible structural model is proposed.

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