Ceramics-Silikáty 49 (2) 132-137 (2005)

Reactivity of FeVO₄ towards Mg₂V₂O7 and phase relations in the FeVO₄ - Mg₂V₂O₇ system up to the solidus line

A. Blonska-Tabero, M. Kurzawa

Reaction products of FeVO₄ with Mg₂V₂O₇ were investigated in the whole concentration range of the reacting substances. On the basis of the results obtained a diagram of phase equilibria was worked out for the system FeVO₄ - Mg₂V₂O₇ for the solid state. Methods applied in the investigations were XRD and DTA. The system FeVO₄ - Mg₂V₂O₇ is a real binary system in the concentration range up to 50.00 mol% FeVO₄ in initial mixtures. For higher initial FeVO₄ ratio, one obtains an intersection of the ternary system MgO - V₂O₅ - Fe₂O₃ crossing three subsidiary subsystems each being a three component solid phase equilibrium system.

Keywords: XRD, DTA, Iron(III), Orthovanadate(V), Magnesium divanadate(V), Phase equilibria