Compression of Zr2InC to 52 GPa

Manoun, Bouchaib; Saxena, S. K.; Liermann, H. P.; Gulve, R. P.; Hoffman, E.; Barsoum, M. W.; Hug, G.; Zha, C. S.
August 2004
Applied Physics Letters;8/30/2004, Vol. 85 Issue 9, p1514
Academic Journal
Using a synchrotron-radiation source and a diamond-anvil cell, we measured the pressure dependence of the lattice parameters of a polycrystalline Zr2InC sample. Up to a pressure of 52 GPa, no phase transformations were observed. As observed in Ti3SiC2 and Ti3Si0.5Ge0.5C2, the compressibility of Zr2InC along the c axis was greater than along the a axis. The bulk modulus is 127±5 GPa, with a pressure derivative of 4.25±0.3; the former is in excellent agreement with our ab initio calculations (130.9 GPa). The a (3.367 Å) and c (15.100 Å) parameters from the ab initio calculations are also slightly larger than those measured here, viz., 3.35 and 14.91 Å. Surprisingly, a hysteresis was observed in the a-lattice parameters; they were higher upon unloading than loading. The reason for this hysteresis is not clear at this time.


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