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Paton Electric Welding Institute, show that the flux for ESR of titanium can consist of special purity refractory fluorides of alkali-earth metals: calcium fluoride, strontium fluoride and barium fluoride [5], and also the fluorides of rare-earth metals (FREM) based on La[F.
NIST scientists are attempting to nullify the birefringence by using mixed crystals of calcium fluoride and barium fluoride, a substance that exhibits opposite birefringence behavior.
Inherent birefringence has been characterized for calcium fluoride (CaF2) and barium fluoride (BaF2); BaF2 and CaF2 are of opposite sign.