X-ray structural investigation of the oxyvanite (V₃ O₅) - berdesinskiite (V₂ TiO₅ ) series: V⁴⁺ substituting for octahedrally coordinated Ti⁴⁺

Authors: Armbruster, Thomas; Galuskin, Evgeny V.; Reznitsky, Leonid Z.; Sklyarov, Evgeny V.

Source: European Journal of Mineralogy, Volume 21, Number 4, August 2009 , pp. 885-891(7)

Publisher: E. Schweizerbart'sche Verlagsbuchhandlung

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Abstract:

The crystal structures of three different solid-solution members between the new mineral oxyvanite (V₃ O₅) - and berdesinskiite (V₂ TiO₅ ) from a quartzite rock in the Pereval marble quarry of the Sludyanka complex, south of Lake Baikal (Russia), have been refined in space group C 2/ c (a ≈ 10.0, b 5.0, c ≈ 7.0 Å , β ≈ 111°) from X-ray single-crystal diffraction-data. The composition of the studied crystals, determined by electron-microprobe analyses, is: (V³⁺_1.67 Cr³⁺_0.33(V⁴⁺_0.59 Ti⁴⁺_0.41)O_5,(V³⁺_1.67Cr³⁺_0.33)(V⁴⁺_0.46Ti⁴⁺^0.54) O₅, and (V³⁺_1.38Cr³⁺_0.61)(V⁴⁺_0.24Ti⁴⁺_0.76O₅ . 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 V₂ TiO₅ and V₃ O₅ 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).

Keywords: OXYVANITE; V3 O5; BERDESINSKIITE; V2 TIO5; CRYSTAL STRUCTURE; SINGLE-CRYSTAL X-RAY DIFFRACTION; VANADIUM VALENCE; V3Þ V4&THORN

Document Type: Research article

DOI: http://dx.doi.org/10.1127/0935-1221/2009/0021-1951

Publication date: 2009-08-01

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