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Pinwen Zhu
Public Documents
1
Shock compression of coesite up to 950 GPa
Xiaokang Feng
and 9 more
May 28, 2024
Experimental investigations of silica under high pressure and temperature offer crucial insights into modeling of Earth and super-Earth’s interiors. Despite extensive studies on Hugoniots of silica polymorphs like fused-silica (2.20 g/cm3), quartz (2.65 g/cm3) and stishovite (4.29 g/cm3) up to tera-pascal, the initial density dependent Hugoniots leave an unexplored region of melting and liquid of silica at high pressures. This emphasizes the urgence to supplementing the phase diagram to constrain silica properties under extreme conditions. Here, the Hugoniot and shock temperature of coesite (2.92 g/cm3), were studied by laser shock compressions up to 950 GPa. Our findings confirm the shock-induced superheating in coesite, reveals a higher Grüneisen parameter and lower electrical conductivity compared to those of fused-silica and quartz along an isothermal line (< 2×104 K). These results suggest unique properties of shocked coesite, and implys a warmer and longer survival silica magma ocean in earlier rocky-planetary interior.