Shock Compression of Coesite up to 950 GPa
Abstract Experimental investigations of silica under high pressure and temperature offer crucial insights into modeling of Earth and super‐Earths’ interiors. Despite extensive studies on Hugoniots of silica polymorphs like fused‐silica (2.20 g/cm 3 ), quartz (2.65 g/cm 3 ) and stishovite (4.29 g/cm 3 ) up to a terapascal, unexplored region of melting and liquid of silica at high pressures is leaved because of the Hugoniots dependence on ambient density. This emphasizes the urgence to supplement the phase diagram to constrain silica properties under extreme conditions. Here, the Hugoniot and shock temperature of coesite (2.92 g/cm 3 ) were studied by laser shock compression experiments up to 950 GPa. Our findings confirm shock‐induced superheating in coesite, revealing a higher Grüneisen parameter and lower electrical conductivity compared to those of fused‐silica and quartz along an isothermal line (<2 × 10 4 K). These results suggest unique properties of shocked coesite, which imply a warmer and longer‐lived silica magma ocean of earlier rocky‐planets.
Authors
- Pinwen Zhu (ORCID: https://orcid.org/0000-0002-3377-0816)
- Xiaokang Feng (ORCID: https://orcid.org/0009-0003-2361-2034)
- Liang Sun (ORCID: https://orcid.org/0000-0003-1434-9943)
- Takayoshi Sano (ORCID: https://orcid.org/0000-0001-9106-3856)
- Jia Qu (ORCID: https://orcid.org/0000-0002-3472-0044)
- Norimasa Ozaki (ORCID: https://orcid.org/0000-0002-7320-9871)
- Keita Nonaka
- Wenge Yang (ORCID: https://orcid.org/0000-0001-8436-8731)
- Toshimori Sekine (ORCID: https://orcid.org/0000-0003-4900-9244)
- Kento Katagiri (ORCID: https://orcid.org/0000-0001-8913-1047)
Institutions
- Jilin University (CN)
- Chinese Academy of Engineering (CN)
- Shanghai Advanced Research Institute (CN)
- Center for High Pressure Science and Technology Advanced Research (CN)
- State Key Laboratory of High Pressure and Superhard Materials (CN)
- The University of Osaka (JP)
Publication Details
- Journal
- Geophysical Research Letters
- Published
- 2024-12-19
- DOI
- https://doi.org/10.1029/2024gl109873
- Citations
- 2
- Primary Topic
- High-pressure geophysics and materials
- Type
- article
- Field-Weighted Citation Impact
- 1.07
Funders
- Ministry of Education, Culture, Sports, Science and Technology
- National Natural Science Foundation of China
- Science and Technology Commission of Shanghai Municipality
- Natural Science Foundation of Shandong Province
- Japan Society for the Promotion of Science