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The heterogeneous nucleation of solid silicon is studied when molten droplets solidify on various substrates. An experimental installation has been developed in order to record in real time the melting–solidification process, measure the undercooling temperature and look at the solidification of the droplets. Three different categories of substrate materials are studied: oxides (silica, zyarock and...
The interaction of nitrogen with liquid and solid silicon at high temperature is investigated in an electromagnetic levitation set-up. It is shown that the nucleation undercooling of Si decreases monotonically from 300 to 1K when the concentration of nitrogen in the solidified droplet increases from 0 to 600ppmw. Several α- and β-Si 3 N 4 morphologies are observed and their growth...
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