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 obtained. Glasses were characterized by X-ray diffraction, differential thermal analysis (DTA), IR and Mossbauer spectroscopy. The glass transformation temperature, T-g, varied between 270 and 442 degrees C, and the crystallization temperature, T-x, was in the range of 342-550 degrees C. Structural models for glasses of the V2O5-Bi2O3-Fe2O3 system are suggested on the basis of IR and Mossbauer spectral investigations. It was shown that the glasses possess [VO5,], [VO4], [BiO6], [FeO6] and [FeO4] groups as basic structural units.