High-pressure x-ray diffraction study of Ta4AlC3
Bouchaib ManounFlorida International University Center for Study of Matter at Extreme Conditions (CeSMEC), , VH-140, University Park, Miami, Florida 33199Surendra K. SaxenaFlorida International University Center for Study of Matter at Extreme Conditions (CeSMEC), , VH-140, University Park, Miami, Florida 33199T. El‐Raghy3-ONE-2 , 4 Covington Place, Voorhees, New Jersey 08043Michel W. BarsoumDrexel University Department of Materials Science and Engineering, , Philadelphia, Pennsylvania 19104
2006en
ABI
Abstract
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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