Very high optical quality single crystals of LaF3, CeF3, PrF3, and NdF3 have been grown. With a multiport graphite crucible, as many as six crystals have been prepared in a single experiment. The crystals were grown in a dynamic helium-hydrogen fluoride atmosphere in a modified Stockbarger-type furnace. Ion exchange purification methods have resulted in LaF3 crystals transparent to 0.14 μ.
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Robinson et al. (1966) studied this question.
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