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Synthesis and structure investigation of the Pb3V(PO4)3 eulytite |
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| Authors: | Roman V. Shpanchenko Rodion V. Panin Catherine Bougerol Evgeny V. Antipov |
| Affiliation: | a Department of Chemistry, Moscow State University, 119992 Moscow, Russia b EMAT University of Antwerp (RUCA), Groenenborgerlaan 171, 2020 Antwerp, Belgium c Equipe NPSC DRFMC/SP2M CEA Grenoble, 17 rue des Martyrs, 38054 Grenoble cedex France d NIMS, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan |
| Abstract: | Lead vanadium phosphate Pb3V(PO4)3 was synthesized by solid state reaction and characterized by X-ray single crystal and powder diffraction, electron microscopy, and magnetic susceptibility measurements. The crystal structure model of Pb3V(PO4)3 was refined using X-ray single crystal data (a=10.127(1)Å, S.G.  Z=4). The compound has an eulytite-like structure and its average structure model may be presented as a three-dimensional network formed by strongly distorted mixed (Pb/VIII) metal-oxygen octahedra connected by edge sharing and forming corrugated chains. The octahedra are additionally linked by tetrahedral phosphate groups via corner sharing. Lead and vanadium atoms randomly occupy two close positions in the octahedra. The electron microscopy study revealed the presence of a rhombohedral superstructure with  and  indicating ordering in the structure. The same type of superstructure was found by us for two another lead-containing eulytite Pb3Fe(PO4)3 where Fe+3 has an ionic radius close to that of V+3. Magnetic susceptibility measurements revealed Curie-Weiss behavior for the Pb3V(PO4)3 compound. |
| Keywords: | Lead vanadium phosphate Eulytite Superstructure Magnetic properties |
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