Terrestrial Measurements of Diffusivities in Refractory Melts by Pulsed Melting of Thin Films
Sanders, Paul G.
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CitationSanders, Paul G. and Michael J. Aziz. 2001. In Proceedings of the Microgravity Materials Science Conference 2000, June 6-8, 2000, Huntsville, Alabama, ed. NASA Microgravity Materials Science Conference and Narayanan Ramachandran. Washington, D.C.: NASA.
AbstractLaterally homogeneous pulsed melting of thin films is being investigated as a way to eliminate convection and thereby determine diffusivities in refractory mels under terrestrial conditions, providing comparison data for microgravity measurements. The silicon liquid self-diffusivity was determined by pulsed laser melting for 30Si+ experimental concentration spatial profile given the initial concentration profile and the temporal melt-depth profile. The silicon liquid self-diffusivity at the melting point (4.0 plus or minus 0.5) X 10-4cm2/s. Calculations of Buoyancy and Marangoni convection indicate that convective contamination is unlikely.
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