A Mixed Valent Vanadium Phosphate Closely Related to BaV2P2O10: AgV2P2O10

✍ Scribed by A. Grandin; J. Chardon; M.M. Borel; A. Leclaire; B. Raveau

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 207 KB
• Volume: 104
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1993.1157

✦ Synopsis

The structure of the mixed valent phosphate (\mathrm{AgV}{2} \mathrm{P}{2} \mathrm{O}{10}) has been determined from a single crystal X-ray study. It crystallizes in the space group (P 2{1} / c) with (a=5.256(1) \AA, b=8.117(1) \AA, c=16.966) (1) (\AA), (\beta=91.46(1)^{\circ}). The (\left[\mathrm{V}{2} \mathrm{P}{2} \mathrm{O}{10}\right]{x}) framework derives from that of (\mathrm{BaV}{2} \mathrm{P}{2} \mathrm{O}{10}) by a strong displacement of one kind of oxygen atom, leading to the formation of (\mathrm{V}{2} \mathrm{O}{10}) units of edge-sharing octahedra, instead of (\mathrm{VO}{9}) pyramids. This tunnel structure is described in terms of octahedral strings (\left[\mathrm{V}{4} \mathrm{O}{20}\right]) built up from corner-sharing (\mathrm{VO}{6}) octahedra and (\mathrm{V}{2} \mathrm{O}{10}) units, linked through (\mathrm{PO}{4}) monophosphate groups. (\mathrm{V}(\mathrm{IV})) sits in (\mathrm{V}{2} \mathrm{O}{10}) units, whereas (\mathrm{V}(\mathrm{V})) occupies the "isolated octahedra" according to bond valence calculations. 1993 Academic Press. Inc.