This article is cited in 9 papers

Phase transitions

Symmetry analysis of ordered phases of the lower tungsten carbide W$_2$C

A. S. Kurlov, S. V. Rempel', A. I. Gusev

Institute of Solid State Chemistry, Urals Branch of the Russian Academy of Sciences, Ekaterinburg

Abstract: The channels of disorder-order phase transitions through which there can arise orthorhombic (space group $Pbcn$) $\beta'$-W$_2$C, rhombohedral (space group $P\bar3m1$) $\beta''$-W$_2$C, and trigonal (space group $P\bar31m$) $\varepsilon$-W$_2$C superstructures of the disordered lower hexagonal carbide $\beta$-W$_2$C have been determined. The distribution functions of carbon atoms in the superstructures under consideration have been calculated, and the physically admissible sequence of transformations associated with the ordering of the lower carbide $\beta$-W$_2$C that occur with a decrease in the temperature has been established.

Received: 13.04.2010

 English version: Physics of the Solid State, 2011, 53:1, 175–181

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