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Re-Investigation of the Structure of 7Bi2O3 · 2WO3 by Single-Crystal X-ray Diffraction

Abstract : The structure of the oxygen-deficient compound 7Bi2O3 · 2WO3, a fluorite-derivative phase considered a candidate for electronic applications because of its high ionic conductivity, is investigated by singlecrystal X-Ray diffraction employing Ag-Kα radiation (λ = 0.5608 Å) to minimize the effect of the absorption by the heavy metals. The space-group type is I41, the acentric subgroup of I41/a that was previously suggested from powder-diffraction data and precession-camera photographs. Lattice parameters are a = 12.513(2), c = 11.231(4) (Z = 2.5). The sample is twinned by syngonic merohedry, class I, with volume ratio of the individuals 0.58/0.42. The ordering of W partly confirms previous models, with one W fully occupying one of the sites on special position. However, the remaining W goes in a site on general position, which shares with Bi, resulting thus more diluted in the structure. The oxygen vacancies are partly ordered in three of the ten anion sites.
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https://hal.univ-lorraine.fr/hal-01715575
Contributor : Massimo Nespolo <>
Submitted on : Thursday, February 22, 2018 - 6:29:32 PM
Last modification on : Friday, February 23, 2018 - 1:19:15 AM

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Massimo Nespolo, Akiteru Watanabe, Y. Suetsugu. Re-Investigation of the Structure of 7Bi2O3 · 2WO3 by Single-Crystal X-ray Diffraction. Crystal Research and Technology, Wiley-VCH Verlag, 2002, 37 (4), pp.414-422. ⟨hal-01715575⟩

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