Stability field of the high-(P, T) Re2C phase and properties of an analogous osmium carbide phase

Erick A. Juarez-Arellano*, Björn Winkler, Alexandra Friedrich, Lkhamsuren Bayarjargal, Victor Milman, Jinyuan Yan, Simon M. Clark

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)

Abstract

The formation of a hexagonal rhenium carbide phase, Re2C, from the elements has been studied in a laser heated diamond anvil cell in a P, V range of 20-40 GPa and 1000-2000 K. No indication for the existence of cubic rhenium carbide, as suggested in the literature, or any other phase was found and Re2C is the only phase formed in the Re-C system up to around 70 GPa and 4000 K. A fit of a 3rd-order Birch-Murnaghan equation of state to the Re2C P, V-data results in a bulk modulus of B0 = 405 (30) GPa (B = 4.6). The linear compressibility of Re2C along [0 0 1] (∼ 500 GPa) is significantly larger than the compressibility in the (0 0 1) plane (∼ 360 GPa {norm of matrix} [1 0 0]). Based on the observations for Re2C, we predict the structure and elastic properties of an analogous Os2C phase, which is, at least in the athermal limit, more stable than any other osmium carbide studied previously by density functional theory based calculations.

Original languageEnglish
Pages (from-to)577-581
Number of pages5
JournalJournal of Alloys and Compounds
Volume481
Issue number1-2
DOIs
Publication statusPublished - 29 Jul 2009
Externally publishedYes

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