MÖSSBAUER EFFECT AND X-RAY DISTRIBUTION FUNCTION ANALYSIS IN COMPLEX Na2O-CaO-ZnO-Fe2O3-Al2O3-SiO2 GLASSES AND GLASS-CERAMICS
Mössbauer spectroscopy at room temperature has been carried out to determine the state of iron ions in complex glasses and glass ceramics in the SiO2-CaO-ZnO-Na2O-Fe2O3-Al2O3 system. Isomer shift values of the glasses suggest that Fe3+ and Fe2+ are in tetrahedral and octahedral coordination respecti...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 1999 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/84155 |
| Acceso en línea: | http://hdl.handle.net/10261/84155 |
| Access Level: | acceso abierto |
| Palabra clave: | Glass Ceramics Mössbauer spectroscopy X-ray diffraction |
| Sumario: | Mössbauer spectroscopy at room temperature has been carried out to determine the state of iron ions in complex glasses and glass ceramics in the SiO2-CaO-ZnO-Na2O-Fe2O3-Al2O3 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 % of 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 have been 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. |
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