Origin of diffusional light scattering at the non-equilibrium crystal-melt interface |
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| Institution: | Department of Physics, City College of the City University of New York New York, NY 10031, USA;University of Bremen, Faculty of Production Engineering, Badgasteiner Strasse 1, 28359 Bremen, Germany;Leibniz Institute for Materials Engineering IWT, Badgasteiner Strasse 3, 28359 Bremen, Germany |
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| Abstract: | A new model is proposed to explain the anomalous dynamic light scattering observed at the growing crystal-melt interface. With a small initial concentration of dissolved gas in the melt, the concentration at the interface can be driven above saturation by the rejection of solute by the advancing solidification front. Microbubbles of gas can then form near the interface. Because of surface tension, for fixed supersaturation there is a unique bubble size that can exist in equilibrium with the fluid. |
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