CLASS FORMATION AND STRUCTURE IN THE V2O5-BI2O3-FE2O3 GLASSES

Glass formation V2O5-Bi2O3-Fe2O3 system was investigated by the roller -quenching method and low melting V2O5- and Bi2O3-rich glasses were ob tained. Glasses were characterized by X-ray diffraction, differential thermal analysis (DTA), IR and Mossbauer spectroscopy. The glass trans formation temperature, T-g, varied between 270 and 442 degrees C, and the crystallization temperature, T-x, was in the range of 342-550 degr ees C. Structural models for glasses of the V2O5-Bi2O3-Fe2O3 system ar e suggested on the basis of IR and Mossbauer spectral investigations. It was shown that the glasses possess [VO5,], [VO4], [BiO6], [FeO6] an d [FeO4] groups as basic structural units.