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A Vanadium (V) Monophosphate with a Tunnel Structure: KV2O4PO4

โœ Scribed by F. Berrah; M.M. Borel; A. Leclaire; M. Daturi; B. Raveau

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
311 KB
Volume
145
Category
Article
ISSN
0022-4596

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โœฆ Synopsis

A vanadium (V) monophosphate, KV 2 O 4 PO 4 , with an original tunnel structure has been synthesized. It crystallizes in the space group Pn2 1 a, with a โ€ซุโ€ฌ 13.924(1) A s s , b โ€ซุโ€ฌ 19.946(1) A s s , c โ€ซุโ€ฌ 4.749(1) A s s . The [V 2 PO 8 ] framework consists of 903 3 oriented [V 2 O 8 ] pyramidal chains running along a and c, respectively, interconnected by single PO 4 tetrahedra. This framework delimits two sets of tunnels: large S-shaped and smaller eight-sided tunnels running along c and a respectively. The K ุ‰ cations are located approximately at the intersection of these tunnels, with an eightand nine-fold coordination, respectively. The geometry of the chains of corner-sharing VO 5 pyramids is compared to those of the octahedral chains in the perovskite and hexagonal tungsten bronze structures. The existence of two abnormally short V+O bonds per pyramid is emphasized and discussed.

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