Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

This Article Résumé Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Krivovichev, S. V. Articles by Pankratova, O. Yu. Search for Related Content GeoRef GeoRef Citation

CRYSTAL STRUCTURE OF -Cu₂V₂O₇ AND ITS COMPARISON TO BLOSSITE (-Cu₂V₂O₇) AND ZIESITE (ß-Cu₂V₂O₇)

Sergey V. Krivovichev^1,, Stanislav K. Filatov¹, Pavel N. Cherepansky¹, Thomas Armbruster² and Olga Yu. Pankratova³

¹ Department of Crystallography, St.Petersburg State University, University Emb. 7/9, RU-199034 St. Petersburg, Russia
² Laboratorium für chemische and mineralogische Kristallographie, Universität Bern, Freiestrasse 3, CH–3102 Bern, Switzerland
³ Department of Inorganic Chemistry, St.Petersburg State University, University Emb. 7/9, RU-199034 St. Petersburg, Russia

E-mail address: skrivovi{at}mail.ru

Single crystals of -Cu₂V₂O₇ were obtained by the method of chemical transport reactions. The crystal structure [triclinic, P, a 5.0873(10), b 5.8233(11), c 9.4020(18) Å, 99.780(3), ß 97.253(3), 97.202(3), V 269.20(9) ų, Z = 2] has been solved by direct methods and refined to R₁ = 0.021 (wR₂ = 0.049) using 949 unique observed reflections with |F_o| 4_F. The atomic arrangement contains two symmetrically independent Cu²⁺ cations. The Cu(1) site is coordinated by six O atoms to form a distorted Cu(1)O₆ octahedron, whereas the Cu(2) site is coordinated by five O atoms arranged at the vertices of an elongate Cu(2)O₅ square pyramid. Two symmetrically independent V⁵⁺ cations are tetrahedrally coordinated by four O atoms each. The O(5) atom bridges the V(1)O₄ and V(2)O₄ tetrahedra. The Cu(1)O₆ octahedra and Cu(2)O₅ square pyramids form two types of chains running parallel to the a axis. The chains are linked by V₂O₇ groups into a complex heteropolyhedral framework. The structure of -Cu₂V₂O₇ is closely related to the structures of -Cu₂V₂O₇ (blossite) and ß-Cu₂V₂O₇ (ziesite). The three structures are based upon chains of edge-sharing Cu²⁺ polyhedra linked by V₂O₇ groups. Similarity of the structure of -Cu₂V₂O₇ to the structures of blossite and ziesite indicates possible formation of this phase under natural conditions, such as those that occur in "dry" high-temperature fumaroles of the Izalco (El Salvador) and Tolbachik (Kamchatka, Russia) volcanoes. The structure of -Cu₂V₂O₇ can also be considered as a triclinically distorted derivative of the ß-A₂P₂O₇ structure-type.

Keywords: -Cu₂V₂O₇, blossite, ziesite, fumarole, crystal structure.

This article has been cited by other articles:

				S. V. Krivovichev, L. P. Vergasova, S. N. Britvin, S. K. Filatov, V. Kahlenberg, and V. V. Ananiev PAUFLERITE, {beta}-VO(SO4), A NEW MINERAL SPECIES FROM THE TOLBACHIK VOLCANO, KAMCHATKA PENINSULA, RUSSIA Can Mineral, August 1, 2007; 45(4): 921 - 927. [Abstract] [Full Text] [PDF]