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European Journal of Mineralogy Email Content Delivery
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European Journal of Mineralogy; August/September; v. 21; no. 4; p. 885-891; DOI: 10.1127/0935-1221/2009/0021-1951
© 2009 E. Schweizerbart'sche Verlagsbuchhandlung Science Publishers
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Articles

X-ray structural investigation of the oxyvanite (V3O5) – berdesinskiite (V2TiO5) series: V4+ substituting for octahedrally coordinated Ti4+

Thomas Armbruster1,*, Evgeny V. Galuskin2, Leonid Z. Reznitsky3 and Evgeny V. Sklyarov3

1 Mineralogical Crystallography, Institute of Geological Sciences, Freiestr. 3, University of Bern, 3012 Bern, Switzerland
2 Department of Geochemistry, Mineralogy and Petrography, Faculty of Earth Sciences, University of Silesia, Bedzinska 60, 41-200 Sosnowiec, Poland
3 Institute of the Earth’s crust (IZK) SB RAS, 664033 Irkutsk-33, Russia

* Corresponding author, e-mail: armbruster{at}krist.unibe.ch

The crystal structures of three different solid-solution members between the new mineral oxyvanite (V3O5) – and berdesinskiite (V2TiO5) from a quartzite rock in the Pereval marble quarry of the Sludyanka complex, south of Lake Baikal (Russia), have been refined in space group C2/c (a {approx} 10.0, b {approx} 5.0, c {approx} 7.0 Å, β {approx} 111°) from X-ray single-crystal diffraction-data. The composition of the studied crystals, determined by electron-microprobe analyses, is: (V1.673+Cr0.333+)(V0.594+Ti0.414+)O5, (V1.673+Cr0.333+)(V0.464+Ti0.544+)O5, and (V1.383+Cr0.613+)(V0.244+Ti0.764+)O5. The common structure type of oxyvanite and berdesinskiite can be described by hexagonal closest oxygen packing with 3/5 of the octahedral voids occupied. Site-occupancy refinements support previous studies on synthetic V2TiO5 and V3O5 indicating that a strongly distorted octahedrally coordinated site, forming pairs of face-sharing octahedra, is 1:1 occupied by M3+ and M4+ (Ti4+, V4+) whereas a more regular octahedral site is only occupied by M3+ (V, Cr).

Key-words: oxyvanite, V3O5, berdesinskiite, V2TiO5, crystal structure, single-crystal X-ray diffraction, vanadium valence, V3+, V4+.






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Copyright © 2009 by E. Schweizerbart'sche Verlagsbuchhandlung Science Publishers