Very low density amorphous phase of zircon
| Autor: | Murat Durandurdu, S. Bolat |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Coordination number Thermodynamics 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Amorphous solid Tetragonal crystal system Metamictization Volume (thermodynamics) Polymerization 0103 physical sciences Materials Chemistry Ceramics and Composites medicine Swelling medicine.symptom 0210 nano-technology Zircon |
| Zdroj: | Journal of Non-Crystalline Solids. 513:137-143 |
| ISSN: | 0022-3093 |
| DOI: | 10.1016/j.jnoncrysol.2019.03.023 |
| Popis: | Using a reliable ab initio molecular dynamics method, we investigate the rapid solidification of the zircon melt. Accompanied by amorphization, a drastic volume expansion of 27% is perceived. This value is fairly larger than 18% observed in the metamict zircon. Such a large volume swelling leads to a significant decrease in the mean coordination number of Zr atoms, which is about 5.66 and the lowest one reported so far. On the other hand, the volume expansion is found to have almost no impact on the average coordination number of Si atoms i.e., they maintain their tetragonal coordination. As suggested by earlier investigations, the polymerization of SiO4 units is witnessed but our model shows the highest polymerization with respect to the previous simulations. Based on our findings, we propose that our model does not represent the metamict zircon but a very low density amorphous phase of zircon. |
| Databáze: | OpenAIRE |
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