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Knight, Kevin S. (1992) The crystal structure of russellite; a re-determination using neutron powder diffraction of synthetic Bi2WO6. Mineralogical Magazine, 56 (384) 399-409 doi:10.1180/minmag.1992.056.384.13

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Reference TypeJournal (article/letter/editorial)
TitleThe crystal structure of russellite; a re-determination using neutron powder diffraction of synthetic Bi2WO6
JournalMineralogical MagazineISSN0026-461X
AuthorsKnight, Kevin S.Author
Year1992 (September)Volume56
Issue384
PublisherMineralogical Society
Download URLhttps://rruff.info/doclib/MinMag/Volume_56/56-384-399.pdf+
DOIdoi:10.1180/minmag.1992.056.384.13Search in ResearchGate
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Mindat Ref. ID1845Long-form Identifiermindat:1:5:1845:0
GUID0
Full ReferenceKnight, Kevin S. (1992) The crystal structure of russellite; a re-determination using neutron powder diffraction of synthetic Bi2WO6. Mineralogical Magazine, 56 (384) 399-409 doi:10.1180/minmag.1992.056.384.13
Plain TextKnight, Kevin S. (1992) The crystal structure of russellite; a re-determination using neutron powder diffraction of synthetic Bi2WO6. Mineralogical Magazine, 56 (384) 399-409 doi:10.1180/minmag.1992.056.384.13
In(1992, September) Mineralogical Magazine Vol. 56 (384) Mineralogical Society
Abstract/NotesAbstractThe crystal structure of the displacive ferroelectric mineral russellite, Bi2WO6, has been determined using Rietveld profile refinement of high-resolution, time of flight, neutron powder diffraction data on the synthetic compound. Russellite is orthorhombic, Pca21, with a 5.43726(2) Γ…, b 16.43018(5) Γ…, c 5.458422) Γ…, Z = 4 and is isostructural with the bismuth molybdate mineral koechlinite, Bi2MoO6. The structure consists of layers of tilted WO6 octahedra sandwiched between layers of bismuth and oxygen with the tungsten displaced from the centre of the octahedron by 0.278 Γ…. The orientations of the lone-pair electrons in the Bi3+ cations have been inferred from the 3.0 Γ… coordination shells of both crystallographically independent bismuths, and have been found to be non-centrosymmetric, an effect which may give rise to the tilting of the WO6 octahedra. New laboratory source X-ray powder diffraction data are presented for russellite, which, with supplementary synchrotron powder diffractometry, corroborate the new space group and structure determination.

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