Magnesium carbonate–phosphate glass
| Autor: | Michael E. Fleet, Xiaofeng Wang, Xiaoyang Liu |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Quenching (fluorescence)
Scattering Magnesium Analytical chemistry chemistry.chemical_element Condensed Matter Physics XANES Electronic Optical and Magnetic Materials Phosphate glass law.invention chemistry.chemical_compound chemistry Optical microscope law Materials Chemistry Ceramics and Composites Carbonate Carbon |
| Zdroj: | Journal of Non-Crystalline Solids. 355:2604-2609 |
| ISSN: | 0022-3093 |
| Popis: | Magnesium carbonate–phosphate glasses have been prepared by quenching melts in the MgO–P2O5–CO2 system at 1400–1550 °C and 2.0 GPa, using a piston-cylinder apparatus. Glass compositions extended along the join Mg3P2O8–MgCO3 from 0.167 to 1.0 M CO3/P2O5. Carbonate contents were confirmed using a novel procedure based on the intensity of the π∗ peak of carbon K-edge XANES spectra. FTIR spectra show that only one carbonate environment is present in the glasses, and suggest that the glass structure consists of a network of isolated carbonate ( CO 3 2 - ) and orthophosphate ( PO 4 3 - ) anions interconnected by Mg2+ cations. The addition of 5 wt% water to the starting composition did not result in significant change in FTIR spectra, other than in the hydroxyl stretching region. However, a systematic upward shift in the X-ray scattering maximum for the wet glasses remains to be explained. |
| Databáze: | OpenAIRE |
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