Crystal structure and properties of the new vanadyl(IV)phosphates Na2MVO(PO4)2, M=Ca and Sr |
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| Authors: | Victoria V Chernaya Roman V Shpanchenko Evgeny V Antipov Elena N Morozova Joke Hadermann Christoph Geibel |
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| Institution: | a Department of Chemistry, Moscow State University, 119992 Moscow, Russiab Department of Physics, Moscow State University, 119992 Moscow, Russiac EMAT University of Antwerp (RUCA), Groenenborgerlaan 171, 2020 Antwerp, Belgiumd Max-Plank Institute CPfS, Nöthnitzer Str. 40, 01187 Dresden, Germany |
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| Abstract: | Two new complex vanadyl(IV)phosphates Na2MVO(PO4)2 (M=Ca, Sr) were synthesized in evacuated quartz ampoules and investigated by means of X-ray diffraction, electron microscopy, DTA, ESR and magnetic susceptibility measurements. The crystal structure of Na2SrVO(PO4)2 was solved ab initio from X-ray powder diffraction data. Both compounds are isostructural: a=10.5233(3) Å, b=6.5578(2) Å, c=10.0536(3) Å and a=10.6476(3) Å, b=6.6224(2) Å, c=10.2537(3) Å for Ca and Sr, respectively; S.G. Pnma, Z=4. The compounds have a three-dimensional structure consisting of V4+O6 octahedra connected by PO4 tetrahedra via five of the six vertexes forming a framework with cross-like channels. The strontium and sodium atoms are located in the channels in an ordered manner. Electron diffraction as well as high-resolution electron microscopy confirmed the structure solution. The new vanadylphosphates are Curie-Weiss paramagnets in a wide temperature range down to 2 K with θ=12 and 5 K for Ca and Sr phases, respectively. |
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| Keywords: | Sodium strontium vanadium phosphate Sodium calcium vanadium phosphate Vanadylphosphate |
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