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Phase Relations in the Al2O3-V2O5-MoO3 System in the Solid State. The Crystal Structure of AlVO4

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Abstract

Phase relations in the ternary oxide system Al2O3-V2O5-MoO3 in the solid state in air have been investigated by using the x-ray diffraction (XRD) and differential thermal analysis/thermogravimetric (DTA/TG) methods. It was confirmed that in the subsolidus area of the Al2O3-V2O5-MoO3 system, there exist seven phases, that is Al2O3, V2O5(s.s.), MoO3, AlVO4, Al2(MoO4)3, AlVMoO7, and V9Mo6O40. Seven fields, in which particular phases coexist at equilibrium, were isolated. The crystal structure of AlVO4 has been refined from x-ray powder diffraction data. Its space group is triclinic, \( P\bar{1} \), Z = 6, with a = 0.65323(1) nm, b = 0.77498(2) nm, c = 0.91233(3) nm, α = 96.175(2)°, β = 107.234(3)°, γ = 101.404(3)°, V = 0.42555 nm3. The crystal structure of the compound is isotypic with FeVO4. Infrared (IR) spectra of AlVO4 and FeVO4 are compared.

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  1. Department of Inorganic and Analytical Chemistry, Szczecin University of Technology, al. Piastów 42, 71-065, Szczecin, Poland

    Grażyna Dąbrowska, Piotr Tabero & Maria Kurzawa

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  1. Grażyna Dąbrowska
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Correspondence to Grażyna Dąbrowska.

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Dąbrowska, G., Tabero, P. & Kurzawa, M. Phase Relations in the Al2O3-V2O5-MoO3 System in the Solid State. The Crystal Structure of AlVO4 . J. Phase Equilib. Diffus. 30, 220–229 (2009). https://doi.org/10.1007/s11669-009-9503-4

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