Phase transition in SiC from zinc-blende to rock-salt structure and implications for carbon-rich extrasolar planets
-
Yuto Kidokoro
,
Koichiro Umemoto
Abstract
We have investigated the phase transition in SiC between the zinc-blende and rock-salt structures at high pressure and temperature in a laser-heated diamond-anvil cell. Results demonstrate that the transition occurs at 74 GPa and 2100 K with a 21% density increase, reflecting the coordination number rising from four to six. In addition, our ab initio calculations show that the boundary has a negative Clapeyron slope of −4.0 MPa/K at 2000 K. The experimentally determined phase boundary is located between those predicted by GGA and B3LYP functional. This transition may take place inside carbon-rich extrasolar planets, forming a boundary with a large density jump. Since SiC is rigid and highly thermally conductive, thermal convection in an SiC-dominant layer is not likely to occur. Nevertheless, the convection may be possible if planet interiors include both silicon carbide and silicate, and in this case the phase transition could affect the style of thermal convection.
Acknowledgments
We thank Y. Nakajima and R. Sinmyo for their support and advice during high-pressure experiments. Synchrotron XRD measurements were made at BL10XU, SPring-8 (proposals 2015A0080 and 2015B0080). Comments from two anonymous reviewers were valuable to improve the manuscript.
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- Review
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