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Synthesis of Mg2C: A Magnesium Methanide

Authors

  • Dr. Oleksandr O. Kurakevych,

    1. Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Rd. NW Washington, DC 20015 (USA)
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  • Dr. Timothy A. Strobel,

    Corresponding author
    1. Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Rd. NW Washington, DC 20015 (USA)
    • Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Rd. NW Washington, DC 20015 (USA)===

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  • Dr. Duck Young Kim,

    1. Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Rd. NW Washington, DC 20015 (USA)
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  • Dr. George D. Cody

    1. Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Rd. NW Washington, DC 20015 (USA)
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  • We thank Yue Meng for assistance with laser heating and synchrotron XRD measurements and Dionysis Foustoukos for help with GC measurements. This work was supported by DARPA under ARO contract numbers W31P4Q-13-I-0005 and W911NF-11-1-0300. D.Y.K. was supported by the Energy Frontier Research in Extreme Environments Center (EFree) under award number DE-SG0001057. Portions of this work were performed at HPCAT (Sector 16), Advanced Photon Source (APS), Argonne National Laboratory. HPCAT operations are supported by DOE-NNSA under Award No. DE-NA0001974 and DOE-BES under Award No. DE-FG02-99ER45775, with partial instrumentation funding by NSF. APS is supported by DOE-BES, under Contract No. DE-AC02-06CH11357.

Abstract

original image

Ionic carbon: When magnesium and carbon combine in a 2:1 ratio above 15 GPa, a new antifluorite structure is formed. The compound, with composition Mg2C (see picture), is highly ionic, with carbon in a very unusual C4− methanide state.

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