Mg–C System up to 20 GPa: Its Phase Diagram and Stable Magnesium Carbides - Sorbonne Université Access content directly
Journal Articles Journal of Physical Chemistry C Year : 2023

Mg–C System up to 20 GPa: Its Phase Diagram and Stable Magnesium Carbides

Vladimir Z Turkevich
  • Function : Author
Carlos Renero-Lecuna
Yixuan Zhao
  • Function : Author
Yann Le Godec
Timothy A Strobel
Wilson A Crichton
  • Function : Author
Nicolas Guignot
  • Function : Author
Hicham Moutaabbid
  • Function : Author
Ioannis Touloupas
  • Function : Author

Abstract

The phase diagram of the Mg−C system has been constructed up to 20 GPa and ∼4000 K based on complementary Thermo-Calc simulations and experimental data obtained in both ex situ and in situ experiments using X-ray diffraction with synchrotron radiation. Three high-pressure magnesium carbides, namely, β-Mg 2 C 3 , its high-temperature form γ-Mg 2 C 3 , and antifluorite Mg 2 C, have p−T domains of thermodynamic stability. At the same time, the carbides accessible by ambient-pressure synthesis, α-Mg 2 C 3 and MgC 2 , are either metastable or unstable, depending on the temperature, at least up to 20 GPa. Experimental observations show that at ambient conditions, all carbides are metastable and remain unchanged at least for years.
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Dates and versions

hal-04219981 , version 1 (27-09-2023)

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Vladimir Z Turkevich, Carlos Renero-Lecuna, Yixuan Zhao, Yann Le Godec, Timothy A Strobel, et al.. Mg–C System up to 20 GPa: Its Phase Diagram and Stable Magnesium Carbides. Journal of Physical Chemistry C, 2023, 127 (4), pp.1965-1972. ⟨10.1021/acs.jpcc.2c07176⟩. ⟨hal-04219981⟩
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