INVESTIGATION ON THE TERNARY-SYSTEM V/MO/O

During chemical transport reactions mixtures of pseudo-binary Line of intersection V2O5/MoO3 are separated into two phases, the V2O5-(alpha) phase, which MoO3-content depends on the oxygen partial pressure during the deposition and the MoO3 phase which contains no more than 1% (n/n) V2O5. Ternary compounds do not exist on the pseudo-binary line. V9Mo6O40 is formed by the reaction of V2O5 and MoO3 (3:2) under exclusion of oxygen. The compound may be chemically transported under the own oxygen coexistence pressure. It was shown by total pressure measurements of V2O5/MoO3 starting mixtures that the insertion of MoO3 in the alpha-phase and the formation of the V9Mo6O40 phase respectively is connected with elimination of oxygen and the reduction of V-V to V-IV in equivalence of the quantity of incorporated MoO3.