High pressure/temperature equation of state of gold silver alloys

ORAL

Abstract

Gold-silver alloys crystallize in face centered cubic structures, like their constituent pure elements [McKeehan -- Phys.Rev. 20, 424 (1922)]. The cell parameter of the alloys does not scale linearly with the ratio of Ag/Au. In this work we investigate the high-pressure/temperature behavior of gold-silver alloys with different Au/Ag ratios. Powder x-ray diffraction experiments performed at HPCAT/Advanced Photon Source confirm the stability of the alloy's fcc structure to pressures/temperatures exceeding 100 GPa/1000 K. We will present isothermal EOS of the alloys from ambient temperature up to 1000 K, discuss the thermal expansion and its variation with pressure.

*This work performed under the auspices of the US DOE by LLNL under Contract DE-AC52-07NA27344. HPCAT use is supported by DOE-BES, DOE-NNSA, NSF, and the W.M. Keck Foundation. APS is supported by DOE-BES, under Contract No. DE-AC02-06CH11357.

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Authors

  • Zsolt Jenei

    • Lawrence Livermore National Laboratory

  • Magnus J. Lipp

    • Lawrence Livermore National Laboratory

  • Jae-Hyun P. Klepeis

    • Lawrence Livermore National Laboratory

  • Hyunchae Cynn

    • Lawrence Livermore National Laboratory

  • William J. Evans

    • Lawrence Livermore National Laboratory

  • Changyong Park

    • HPCAT, Advanced Photon Source, Argonne National Laboratory