The structures of normal and supercooled liquid silicon metal and SiGe alloy
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- 作者：Shankar Krishnan ; Louis Hennet ; Thomas Key ; Benoit Glorieux ; Marie-Louise Saboungi ; David L. Price
- 关键词：Liquid alloys and liquid metals ; X-ray diffraction ; Medium-range order ; Short-range order
- 刊名：Journal of Non-Crystalline Solids
- 出版年：2007
- 出版时间：15 October 2007
- 年：2007
- 卷：353
- 期：32-40
- 页码：2975-2981
- 全文大小：412 K
文摘
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.