Phase equilibria in the system NiO-V2O5-Fe2O3 in subsolidus area

Reactivity of FeVO4 towards Ni2V2O7 and Ni3V2O8 in the solid state was investigated. On the base of XRD and DTA results, phase diagrams in subsolidus area of the FeVO4 - Ni2V2O7 and FeVO4 - Ni3V2O8 intersections of the ternary system NiO - V2O5 - Fe2O3 have been worked out and the phase diagram of this ternary system in subsolidus area in the whole component concentration range has been verified.