WATER VAPOUR EQUILIBRIA ON VANADIUM AND ITS OXIDES
The oxidation-reduction equilibrium of vanadium has been investigated by the dynamical method of Wartenberg and Aoyama. By the experiment it has been suggested that the chemical changes take place in the two stages under the experimental conditions, and the reactions might be expressed by the following: V+H2O\ightleftarrowsVO+H2 and 2VO+H2O\ightleftarrowsV2O3+H2. Thermodynamic calculations have been made for the above reactions, and the result of the calculated heats of formation agreed fairly well with that of the determina-tions made by other investigators.