Equilibrium phases in Mn-V-O system under ambient atmosphere

摘要

The products obtained from MnO_2-V_2O_5 mixtures at the ambient oxygen pressure and temperatures up to 900 deg. C were studied by means of thermal analysis and x-ray diffraction methods. The following phases were found to exist in equilibrium, depending on the composition : (I) Mn_2O_3-Mn_2V_2O_7 (II) Mn_2V_2O_7MnV_2O_6, and (III) V_2O_5--solid solution of VO_2 in MnV_2O_6. A phase diagram was obtained for the composition region III. The data are instructive for syntheses of manganese vanadates by thermal methods.