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On the compression behaviour of (Ti-0.5,V-0.5)(2)AlC and (Ti-0.5, Nb-0.5)(2)AlC to quasi-hydrostatic pressures above 50 GPa
Journal article   Peer reviewed

On the compression behaviour of (Ti-0.5,V-0.5)(2)AlC and (Ti-0.5, Nb-0.5)(2)AlC to quasi-hydrostatic pressures above 50 GPa

Bouchaib Manoun, Fuxiang Zhang, Surendra K. Saxena, Surojit Gupta and Michel Barsoum
Journal of physics. Condensed matter, v 19(24)
20 Jun 2007
DOI: https://doi.org/10.1088/0953-8984/19/24/246215
PMID: 21694058

Abstract

Physical Sciences Physics Physics, Condensed Matter Science & Technology
Using a synchrotron x-ray radiation source and a diamond anvil cell we measured the functional dependences of the lattice parameters of (Ti-0.5, V-0.5)(2)AlC and (Ti-0.5, Nb-0.5)(2)AlC to quasi-hydrostatic pressure of the order of 50 GPa. Like for other solids in this family of layered ternary carbides and nitrides, the bulk moduli (approximate to 183 GPa) are high and no phase transformations were observed. The bulk moduli of the solid solution compositions were lower than those of the end members. The effect was much more dramatic when Ti replaced Nb in Nb2AlC than when it replaced V in V2AlC. In the former case the modulus drops by 13% from 209 GPa, with the softening coming almost exclusively from the c-axis. This somewhat surprising result is ascribed to the corrugation of the Ti-Nb planes in (Ti-0.5, Nb-0.5)(2)AlC. When Ti replaced V in V2AlC the drop in modulus was 8%.

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Domestic collaboration
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Physics, Condensed Matter
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