X-ray diffraction study of aluminum carbide powder to 50 GPa

Cheng Ji, Yanzhang Ma, Ming Chien Chyu, Russell Knudson, Hongyang Zhu

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The crystal structure and equation of state (EOS) of aluminum carbide (Al4 C3) have been determined directly up to 50.1 GPa at room temperature by the synchrotron x-ray diffraction techniques. The results indicate that Al4 C3 remained in rhombohedral structure under all tested pressure-temperature conditions and exhibited anisotropic compressibility, with the c -axis more compressible than the a -axis. Fitting the experimental data to third order Birch-Murnaghan EOS yields a bulk modulus of KOT =233±6 GPa with its pressure derivative K OT′ =3.4±0.4, while the second-order EOS yields K OT =223±2 GPa.

Original languageEnglish
Article number083511
JournalJournal of Applied Physics
Issue number8
StatePublished - 2009


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