Anomalous Behaviour of Fused Cryolite


NATURAL cryolite (Na3AlF6), when fused in a platinum crucible, yields a typical 'wetting' melt, which gradually spreads over the interior of the crucible and may even creep over the edge. When minute amounts of lead, bismuth or thallium compounds are added, a remarkable and practically instantaneous change is observed in the nature of the melt, which becomes 'non-wetting' and forms a single large drop with sharply defined boundaries.

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SCOTT, T. Anomalous Behaviour of Fused Cryolite. Nature 157, 480–481 (1946).

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