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INVESTIGATION TO ESTABLISH HOW IMPURITY ATOMS AFFECT CRYSTAL NUCLEATION
GENERAL ELECTRIC CO SCHENECTADY N Y
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The theory of preferential etching at dislocations has been presented by Cabrera Phil. Trans. Roy. Soc. London. Ser. A. 243299, 1951. In Part I of this report the theory is reviewed and compared to empirical observations on the dissolution of lithium fluoride. The observed dissolution behavior is consistent with Cabreras theory as modified by the effect of dissolution poisons. The presence of a few parts per million of step poisons strongly alters both crystal growth and dissolution rates. It was known that a few parts per million ferric fluoride was a poison for the dissolution of lithium fluoride. In Part II of this report it is shown that ferric fluoride is also a growth poison for lithium fluoride from aqueous solution. Ferric fluoride has the properties characterizing a step poison for the lithium fluoride-water system. Author
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