Structural modifications of GeO$_2$ glass under high pressure and high temperature
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866909098853793792 |
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| author | Cornet, Antoine Molherac, Remy Champagnon, Bernard Martinet, Christine |
| author_facet | Cornet, Antoine Molherac, Remy Champagnon, Bernard Martinet, Christine |
| contents | Vitreous GeO$_2$ has been compressed at high temperature, to investigate the effect of thermal activation on the structural reorganization during compression. The measurements were performed in-situ using micro Raman spectroscopy under pressure up to 6 GPa and temperature up to 400$^\circ$C. The evolution of the Raman shift of the main band (400-500 cm$^{-1}$) with temperature during compression evidences a pressure window around 3 GPa within which temperature has a remarkable influence on the structure, in particular the intermediate range order. We find that this change is well correlated with previous ex-situ density measurements from high pressure-high temperature densifications. Moreover, coordination changes from tetrahedrally (GeO$_4$) to octahedrally (GeO$_6$) coordinated GeO$_2$ are accelerated with the heating during the compression. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_05326 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Structural modifications of GeO$_2$ glass under high pressure and high temperature Cornet, Antoine Molherac, Remy Champagnon, Bernard Martinet, Christine Applied Physics Materials Science Vitreous GeO$_2$ has been compressed at high temperature, to investigate the effect of thermal activation on the structural reorganization during compression. The measurements were performed in-situ using micro Raman spectroscopy under pressure up to 6 GPa and temperature up to 400$^\circ$C. The evolution of the Raman shift of the main band (400-500 cm$^{-1}$) with temperature during compression evidences a pressure window around 3 GPa within which temperature has a remarkable influence on the structure, in particular the intermediate range order. We find that this change is well correlated with previous ex-situ density measurements from high pressure-high temperature densifications. Moreover, coordination changes from tetrahedrally (GeO$_4$) to octahedrally (GeO$_6$) coordinated GeO$_2$ are accelerated with the heating during the compression. |
| title | Structural modifications of GeO$_2$ glass under high pressure and high temperature |
| topic | Applied Physics Materials Science |
| url | https://arxiv.org/abs/2402.05326 |