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Phase transition in SiC from zinc-blende to rock-salt structure and implications for carbon-rich extrasolar planets

Yuto Kidokoro, Koichiro Umemoto, Kei Hirose and Yasuo Ohishi
Phase transition in SiC from zinc-blende to rock-salt structure and implications for carbon-rich extrasolar planets
American Mineralogist (November 2017) 102 (11): 2230-2234

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.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 102
Serial Issue: 11
Title: Phase transition in SiC from zinc-blende to rock-salt structure and implications for carbon-rich extrasolar planets
Affiliation: Tokyo Institute of Technology, Department of Earth and Planetary Sciences, Tokyo, Japan
Pages: 2230-2234
Published: 201711
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 29
Accession Number: 2018-021716
Categories: Geophysics of minerals and rocksExtraterrestrial geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
Secondary Affiliation: Japan Synchrotron Radiation Research Institute, JPN, Japan
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201806
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