✦ LIBER ✦

Phase Formation in Cu3+1.5xR4−x(VO4)6 (R=Fe and Cr) Systems: Crystal Structure of Cu2.5Fe4.333(VO4)6, Cu4Fe3.333(VO4)6, and Cu4.05Cr3.3(VO4)6

✍ Scribed by A.A. Belik; A.P. Malakho; K.V. Pokholok; B.I. Lazoryak

Publisher: Elsevier Science
Year: 2001
Tongue: English
Weight: 320 KB
Volume: 156
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.2000.9004

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✦ Synopsis

Phase formation in the Cu 3؉1.5x R 4؊x (VO 4 ) 6 (R ‫؍‬ Fe and Cr) systems was studied at 6703C by powder X-ray di4raction. In the Cu 3؉1.5x Fe 4؊x (VO 4 ) 6 system there are two compounds having homogeneity ranges with formula Cu 3؉1.5x Fe 4؊x (VO 4 ) 6 (0.6674 x(0.778) and Cu 3؉1.5x Fe 4؊x (VO 4 ) 6 (؊0.3334x4؊0.167) with structures of mineral lyonsite and mineral howardevansite (or Fe 7 (PO 4 ) 6 ), respectively. The structures of Cu 2.5 Fe 4.333 (VO 4 ) 6 and Cu 4 Fe 3.333 (VO 4 ) 6 were re5ned by Rietveld method: space group P1 ,

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