On the valence state and coordination of iron cations in alumino-silicate glasses
| Autor: | Krystyna E. Lipinska-Kalita, E. M. Görlich |
|---|---|
| Rok vydání: | 1988 |
| Předmět: |
Valence (chemistry)
Mössbauer effect Coordination number Condensed Matter Physics Electronic Optical and Magnetic Materials chemistry.chemical_compound Crystallography Devitrification Nuclear magnetic resonance chemistry Octahedron Aluminosilicate Materials Chemistry Ceramics and Composites Crystallite Magnetite |
| Zdroj: | Journal of Non-Crystalline Solids. 107:73-80 |
| ISSN: | 0022-3093 |
| DOI: | 10.1016/0022-3093(88)90095-6 |
| Popis: | Measurements of the Mossbauer effect in 57Fe were performed in selected alumino-silicate glasses. The influence of the preparation temperature of the studied glasses on the valence state and coordination number of iron cations is discussed. It is found that Fe2+ ions are only octahedrally coordinated, while Fe3+ ions are present both in tetrahedral and octahedral coordination. In some partly crystallized galsses both Fe2+ and Fe3+ cations were found to occupy only sites of tetrahedral coordination in the glass matrix. The Mossbauer spectra clearly reveal the presence of magnetite crystallites and the decrease of their contribution with an increase of the glass preparation temperature. The existence of the magnetite phase was confirmed by the X-ray diffraction. The devitrification process is marked by the magnetite-hematite transformation and the decrease of iron content in the glass matrix. Electrochemical methods were used for independent determination of the Fe2+/Fe3+ ratio. |
| Databáze: | OpenAIRE |
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