Glass formation in the MoO3-CuO system
Authors: Iordanova, R.S.; Milanova, M.K.; Kostov, K.L.
Source: Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B, Volume 47, Number 6, December 2006 , pp. 631-637(7)
Publisher: Society of Glass Technology
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Abstract:
Glasses in the MoO3-CuO system are obtained at high cooling rates (104-105 K/s) in MoO3-rich compositions. Characterisation of the glasses is made by x-ray diffraction (XRD), infrared spectroscopy and x-ray photoelectron spectroscopy (XPS). Structural models for MoO3-CuO glasses are suggested on the basis of infrared spectral investigation, and by comparing with known crystalline structures. The addition of CuO to MoO3 leads to depolymerisation of the layered molybdate structure. It is transformed into a network composed of corner shared MoO6 units. The latter are converted gradually into isolated MoO4 tetrahedra. The formation of isolated structure units impairs the glass forming ability of the compositions. The MoO6-MoO4 transformation was also confirmed by XPS. The Mo3d spectra of glasses were modelled in such a way as to separate the contributions of MoO6 from the MoO4 signal. The XPS results indicate also the presence of both Cu+ and Cu2+ ions in the MoO3-CuO glasses.Document Type: Research article
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