Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 353, Issue 32-40, Pages 2975-2981Publisher
ELSEVIER
DOI: 10.1016/j.jnoncrysol.2007.05.176
Keywords
liquid alloys and liquid metals; X-ray diffraction; medium-range order; short-range order
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The atomic structures of liquid Si metal and SiGe alloy in the normal and supercooled liquid states have been measured by X-ray diffraction from aerodynamically levitated and laser heated liquid droplets. The measurements covered a wide range of scattering vector Q (0.8-20 A(-1)) and a wide temperature range that extended into the supercooled region. The present results on liquid Si confirm earlier measurements that showed a decrease in first-shell coordination with increased supercooling. For liquid SiGe, the shoulder on the high-Q side of the first peak in the structure factor S(Q) sharpens with increased supercooling, suggesting an increase in covalent bonding and development of chemical short-range order. (c) 2007 Elsevier B.V. All rights reserved.
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