Structure, energetics, and bonding of amorphous Au-Si alloys

Soo Hwan Lee, Gyeong S. Hwang

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First principles periodic calculations based on gradient-corrected density functional theory have been performed to examine the structure, energetics, and bonding of amorphous Au-Si alloys with varying Au:Si composition ratios. Our results predict that the Au-Si alloy forms the most stable structure when the Si content is around 40-50 at. %, with an energy gain of about 0.15 eV /atom. In addition, the volume change per atom in the alloy exhibits a distinctive nonlinear trend, with the minimum value around 60 at. % Si. The occurrence of the minimum in the Au-Si mixing energy and volume is attributed to strong hybridization of the Au 5d-Si 3p states. We also present variations in the radial distribution function and atomic coordination number as a function of Au:Si composition ratio, with discussion of the nature of local packing and chemical bonding in the Au-Si alloy system.

Original languageEnglish
Article number224710
JournalJournal of Chemical Physics
Issue number22
StatePublished - 2007

Bibliographical note

Funding Information:
We acknowledge National Science Foundation (CAREER-CTS-0449373) and Robert A. Welch Foundation (F-1535) for their financial support. All our calculations were performed using supercomputers in Texas Advanced Computing Center at the University of Texas at Austin.


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