Understanding phase transitions of $α$-quartz under dynamic compression conditions by machine-learning driven atomistic simulations
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866910911307972608 |
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| author | Erhard, Linus C. Otzen, Christoph Rohrer, Jochen Prescher, Clemens Albe, Karsten |
| author_facet | Erhard, Linus C. Otzen, Christoph Rohrer, Jochen Prescher, Clemens Albe, Karsten |
| contents | Characteristic shock effects in silica serve as a key indicator of historical impacts at geological sites. Despite this geological significance, atomistic details of structural transformations under high pressure and shock compression remain poorly understood. This ambiguity is evidenced by conflicting experimental observations of both amorphization and crystallization transitions. Utilizing a newly developed machine-learning interatomic potential, we examine the response of $α$-quartz to shock compression with a peak pressure of 60 GPa over nano-second timescales. We initially observe amorphization before recrystallization into a d-NiAs-structured silica with disorder on the silicon sublattice, accompanied by the formation of domains with partial order of silicon. Investigating a variety of strain conditions enables us to identify the non-hydrostatic stress and strain states that allow the direct diffusionless formation of rosiaite-structured silica. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_17676 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Understanding phase transitions of $α$-quartz under dynamic compression conditions by machine-learning driven atomistic simulations Erhard, Linus C. Otzen, Christoph Rohrer, Jochen Prescher, Clemens Albe, Karsten Materials Science Geophysics Characteristic shock effects in silica serve as a key indicator of historical impacts at geological sites. Despite this geological significance, atomistic details of structural transformations under high pressure and shock compression remain poorly understood. This ambiguity is evidenced by conflicting experimental observations of both amorphization and crystallization transitions. Utilizing a newly developed machine-learning interatomic potential, we examine the response of $α$-quartz to shock compression with a peak pressure of 60 GPa over nano-second timescales. We initially observe amorphization before recrystallization into a d-NiAs-structured silica with disorder on the silicon sublattice, accompanied by the formation of domains with partial order of silicon. Investigating a variety of strain conditions enables us to identify the non-hydrostatic stress and strain states that allow the direct diffusionless formation of rosiaite-structured silica. |
| title | Understanding phase transitions of $α$-quartz under dynamic compression conditions by machine-learning driven atomistic simulations |
| topic | Materials Science Geophysics |
| url | https://arxiv.org/abs/2406.17676 |