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On the compression behavior of Ti2InC, (Ti-0.5, Zr-0.5)(2)InC, and M2SnC (M = Ti, Nb, Hf) to quasi-hydrostatic pressures up to 50 GPa
Journal article   Peer reviewed

On the compression behavior of Ti2InC, (Ti-0.5, Zr-0.5)(2)InC, and M2SnC (M = Ti, Nb, Hf) to quasi-hydrostatic pressures up to 50 GPa

Bouchaib Manoun, O. D. Leaffer, S. Gupta, E. N. Hoffman, S. K. Saxena, J. E. Spanier and M. W. Barsoum
Solid state communications, v 149(43-44), pp 1978-1983
01 Nov 2009
DOI: https://doi.org/10.1016/j.ssc.2009.05.043

Abstract

Physical Sciences Physics Physics, Condensed Matter Science & Technology
Using a synchrotron X-ray radiation source and a diamond anvil cell we measured the dependences of the lattice parameters on quasi-hydrostatic pressure of the order of 50 GPa of the following MAX phases:Ti2InC, (Ti-0.5, Zr-0.5)(2)InC, Zr2InC and Ti2SnC, Nb2InC and Hf2InC. Like other MAX phases, the phases studied herein were all stable up to approximate to 50 GPa. In both series, the substitution of Ti (r = 1.32 angstrom) by the larger sized metals, Zr or Nb (with r varying between 1.34 and 1.55 angstrom) resulted in larger unit cell parameters and volumes. At 152 +/- 3 and 148 +/- 3 GPa, the respective bulk moduli, K-o, of Ti2SnC and Ti2InC are quite comparable. Replacing Ti by Hf or Nb in Ti2SnC leads to increases in K-o by 11% and 18%, respectively. Conversely, replacing half the Ti by Zr in Ti2InC leads to a 13% drop in K-o; replacing all of the Ti drops it by 16.5%. Most of these trends are reproduced in our ab initio calculations of K-o For all compositions, the compressibilities along the c-direction were greater than those along the a-direction. For the M2SnC series, the compressibilities along the c-axes were quite similar; the compressibilities along the a-axis of Ti2SnC were greater than in the Nb- or Hf-containing ternaries. The c-axis compressibilities of the in-containing compounds were almost indistinguishable. The compressibilities along the a-axes of (T-i0.5, Zr-0.5)(2)InC and Zr2InC were also quite comparable; those of Ti2InC was less compressible. (C) 2009 Published by Elsevier Ltd

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Physics, Condensed Matter
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