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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Compression behavior of TaC0.98 under nonhydrostatic and quasi-hydrostatic pressures up to 76 GPa
International Journal of Refractory Metals and Hard Materials, Volume 23, No. 2, Year 2005
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Description
Powder samples of TaC0.98 sandwiched between aluminum disks were placed in a rhenium gasket and compressed in a diamond anvil cell. The X-ray diffraction patterns were recorded under pressures up to 50 GPa using synchrotron radiation. The presence of aluminum in the cell rendered the sample pressure nearly hydrostatic and also served as the pressure standard. In another set experiments, TaC0.98 powder mixed with small quantity of platinum powder was placed in stainless steel gasket and compressed between the anvils. The X-ray diffraction patterns were recorded up to 76 GPa. In absence of any pressure-transmitting medium, the stress state of the sample was expected to be highly nonhydrostatic. The diffraction data were analyzed using lattice strain theory to estimate t, the difference between the axial and radial stress components in the sample. The magnitudes of t suggest that the lower limit of compressive strength of TaC0.98 increases with increasing pressure and reaches ∼11 GPa at 76 GPa pressure. No phase transformation was observed up to the highest pressure. The bulk modulus and its pressure derivative derived from the volume-compression-pressure data are 345(9) GPa and 4.0(4), respectively. © 2004 Elsevier Ltd. All rights reserved.
Authors & Co-Authors
Manoun, B.
United States, Miami
Florida International University
Saxena, Surendra Kumar
United States, Miami
Florida International University
Zha, Changsheng
United States, Ithaca
Cornell University
Statistics
Citations: 38
Authors: 3
Affiliations: 4
Identifiers
Doi:
10.1016/j.ijrmhm.2004.11.004
ISSN:
02634368
Research Areas
Cancer