Browsing by Author "Romero M."

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    Mössbauer effect and X-ray distribution function analysis in complex Na2O-CaO-ZnO-Fe2O3-Al2O 3-SiO2 glasses and glass-ceramics
    (1999-01-01) Romero M.; Rincón J.; Mûsik S.; Kozhukharov V.
    Mössbauer spectroscopy at room temperature was carried out to determine the state of iron ions in complex glasses and glass-ceramics in the SiO2-CaO-ZnO-Na2O-Fe2O3-Al 2O3 system. Isomer shift values of the glasses suggest that Fe3+ and Fe2+ are in tetrahedral and octahedral coordination, respectively. The spectrum of the glass-ceramic shows that about 60 wt% total iron is in the magnetite phase. The Fe+3/Fe+2 ratio varies with the total iron oxide content of the glasses, indicating that the vitreous network is more distorted when the iron content is greater. X-ray diffraction measurements were carried out to obtain the radial distribution function (RDF). The interatomic distances for Si-Si and Si-O have been determined. The complex composition of these glasses does not allow the estimation of Al-O and Fe-O distances. © 1999 Elsevier Science Ltd.