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High-pressure x-ray diffraction study of Ta[sub 4]AlC[sub 3]

✍ Scribed by Manoun, Bouchaib; Saxena, S. K.; El-Raghy, T.; Barsoum, M. W.

Book ID: 121727462
Publisher: American Institute of Physics
Year: 2006
Tongue: English
Weight: 555 KB
Volume: 88
Category: Article
ISSN: 0003-6951
DOI: 10.1063/1.2202387

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✦ Synopsis

Using a synchrotron radiation source and a diamond anvil cell, we measured the pressure dependence of the lattice parameters of a recently discovered phase, Ta4AlC3. This phase adopts a hexagonal structure with the space group P63∕mmc; at room conditions, the a and c parameters are 3.087(5) and 23.70(4)Å, respectively. Up to a pressure of 47GPa, no phase transformations were observed. Like Ta2AlC, but unlike many related phases such as Ti4AlN3, Ti3SiC2, Ti3GeC2, and Zr2InC, the compressibility of Ta4AlC3 along the c and a axes are almost identical. The bulk modulus of Ta4AlC3, 261±2GPa, is ≈4% greater than that of Ta2AlC. Both, however, are ≈37% lower than the 345±9GPa of TaC.

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