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In-situ High-energy X-ray Diffraction Study of the Local Structure of Supercooled Liquid SiWhile changes in the coordination number for liquid silicon upon supercooling, signaling an underlying liquid-liquid phase transition, have been predicted, x-ray and neutron measurements have produced conflicting reports. In particular some studies have found an increase in the first shell coordination as temperature decreases in the supercooled regime, while others have reported increases in the coordination number with decreasing temperature. Employing the technique of electrostatic levitation coupled with high energy x-ray diffraction (125 keV), and rapid data acquisition (100ms collection times) using an area detector, we have obtained high quality structural data more deeply into the supercooled regime than has been possible before. No change in coordination number is observed in this temperature region, calling into question previous experimental claims of structural evidence for the existence of a liquid-liquid phase transition.
Document ID
20050180737
Acquisition Source
Marshall Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Lee, G. W.
(Washington Univ. Saint Louis, MO, United States)
Kim, T. H.
(Washington Univ. Saint Louis, MO, United States)
Sieve, B.
(Iowa State Univ. of Science and Technology Ames, IA, United States)
Gangopadhyay, A. K.
(Washington Univ. Saint Louis, MO, United States)
Hyers, R. W.
(Massachusetts Univ. Amherst, MA, United States)
Rathz, T. J.
(Alabama Univ. Huntsville, AL, United States)
Rogers, J. R.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Robinson, D. S.
(Iowa State Univ. of Science and Technology Ames, IA, United States)
Kelton, K. F.
(Washington Univ. Saint Louis, MO, United States)
Goldman, A. I.
(Iowa State Univ. of Science and Technology Ames, IA, United States)
Date Acquired
August 23, 2013
Publication Date
January 1, 2005
Subject Category
Physics (General)
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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