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Crystal Nucleation in Submicron Droplets of Pure Elements

Published online by Cambridge University Press:  15 February 2011

Louis M. Holzman ,
Thomas F. Kelly  and
W. N. G. Hitchon
Louis M. Holzman
Affiliation:
Materials Science Program, University of Wisconsin, Madison, WI 53706
Thomas F. Kelly
Affiliation:
Materials Science Program, University of Wisconsin, Madison, WI 53706 Materials Science and Engr., University of Wisconsin, Madison, WI 53706
W. N. G. Hitchon
Affiliation:
Materials Science Program, University of Wisconsin, Madison, WI 53706 Electrical and Computer Engr., University of Wisconsin, Madison, WI 53706
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Abstract

Liquid-to-crystal nucleation has been studied extensively through droplet experiments to locate examples of homogeneous nucleation. However, prior to this work very few examples have been found, which implies that the experiments have not been able to isolate heterogeneous nucleants in a small percentage of the droplets as is required. In this research, electrohydrodynamic atomization (EHD) is used to produce sub-Micron droplets of pure elements that are largely free of heterogeneous nucleants.

Diffraction patterns of individual EHD-produced droplets are viewed to determine the fraction of crystalline droplets produced as a function of droplet radius. These results are compared to theories for surface and volume heterogeneous nucleation and for homophase nucleation. It is found that Si and Ge nucleate through either homogeneous nucleation or nucleation by homophase impurities. Nucleation results for vanadium and iron were not conclusive.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 321: Symposium E – Crystallization and Related Phenomena in Amorphous Materials—Ceramics, Metals, Polymers, and Semiconductors , 1993 , 233
Copyright
Copyright © Materials Research Society 1994

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