Abstract
Phases of the formula Mn 1− x ф x V 2−2 x Mo 2 x O 6 with the brannerite-type (α) structure, where ф represents a vacancy at the Mn 2+ site, have been sythesized and characterized by X-ray diffraction and DTA. The X-ray data are listed for MnV 2O 6 and solid solution with x = 0.40. They indicate the random distribution of V and Mo over the original V sites and the random distribution of Mn and vacancies over the original Mn sites. The monoclinic cell dilates with increasing x, primarily in the direction of the b-axis. The phase diagram of the pseudobinary MnV 2O 6MoO 3 system has been determined. The extent of the stability region for the investigated brannerite solid solution has been established ( x max = 0.45 at 583°C). Other features determined in this system were: (a) little solubility of MoO 3 in the high-temperature (β) modification of MnV 2O 6, (b) a two-phase area of α- and β-type solid solution coexistence, (c) a eutectic point between α-type solid solution and MoO 3 at 583°C and 75 mole% of MoO 3 and (d) phase relationships at the liquidus.
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