Reaction of titanium with carbon in a laser heated diamond anvil cell and reevaluation of a proposed pressure-induced structural phase transition of TiC

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

The formation of cubic TiCxfrom the elements was studied in a laser-heated diamond anvil cell at pressures up to 26 GPa. Annealed samples at these pressures show no splitting of the cubic (1 1 1) or (2 2 2) reflection. This is in contrast to an earlier study, in which a splitting of the (1 1 1) reflection was observed above 18 GPa. The recovered sample had a lattice parameter of 4.3238(6) Å, which implies that the synthesis gave fully stoichiometric TiC. Density functional theory-based model calculations were used to study the dependence of the total energy of a rhombohedral distortion. In these model calculations the total energy was minimal for the undistorted (cubic) lattice. Therefore, the results obtained here imply that at least for titanium carbides with a high carbon content no pressure-induced structural phase transition up to at least 26 GPa occurs. The appearance of a trigonal TiCx polymorph during the synthesis is discussed in terms of its relative stability with respect to the cubic phase.

Original languageEnglish
Pages (from-to)392-397
Number of pages6
JournalJournal of Alloys and Compounds
Volume478
Issue number1-2
DOIs
Publication statusPublished - 10 Jun 2009
Externally publishedYes

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