Glass formation in the V2O5-MoO3-ZnO system

Glass formation region in the V2O5-MoO3-ZnO system was determined using low cooling rates (102 K/s). The glasses were obtained in the central part of the system from compositions containing 10-65 mol% V2O5, 10-65 mol% MoO3 and 10-50 mol% ZnO. The amorphous and crystalline phases were characterized by x-ray diffraction (XRD), differential thermal analysis (DTA) and infra-red spectroscopy (IR). According to DTA data the glass compositions with molar ratio of the components near to 1:1:1 are more stable against crystallization. Structural models for V2O5-MoO3-ZnO glasses were suggested on the basis of IR spectral investigation, and by comparing with the data of known crystalline structures. It was established that VO5 groups associated in layers or chains, isolated V2O7 pyrovanadate units and MoO6 groups are the main structural units creating amorphous networks. ZnO depolymerizes vanadate and molybdate amorphous networks (© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)