Romero M.Rincón J.Mûsik S.Kozhukharov V.2024-07-102024-07-102024-07-102024-07-101999-01-010025-540810.1016/S0025-5408(99)00110-5SCOPUS_ID:0342298293https://rlib.uctm.edu/handle/123456789/89Mössbauer 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.enArticle