期刊
NATURE COMMUNICATIONS
卷 13, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41467-022-29762-y
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资金
- US Department of Energy by Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
- U.S Department of Energy [DE-NA0001944, DE-NA0003611]
- National Science Foundation [EAR-1644614]
- Princeton Center for Complex Materials (PCCM)
- National Science Foundation (NSF)-MRSZECZ program [DRM-2011750]
This study determines the atomic-level structure of silicon carbide under high pressure and presents the mass-radius curves for a hypothetical pure SiC planet, which is found to be 10% less dense than terrestrial planets.
There has been considerable recent interest in the high-pressure behavior of silicon carbide, a potential major constituent of carbon-rich exoplanets. In this work, the atomic-level structure of SiC was determined through in situ X-ray diffraction under laser-driven ramp compression up to 1.5 TPa; stresses more than seven times greater than previous static and shock data. Here we show that the B1-type structure persists over this stress range and we have constrained its equation of state (EOS). Using this data we have determined the first experimentally based mass-radius curves for a hypothetical pure SiC planet. Interior structure models are constructed for planets consisting of a SiC-rich mantle and iron-rich core. Carbide planets are found to be similar to 10% less dense than corresponding terrestrial planets.
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