Zirconium tetrahalides containing hafnium in natural abundance are reduced by metallic zirconium or aluminium in molten aluminium halides at 260–310° to yield soluble intermediates from which are deposited single crystals of ZrX3 which have a reduced hafnium concentration.
E. M. Larsen, F. Gil-Arnao, J. W. Moyer and M. J. Camp, J. Chem. Soc. D, 1970, 281 DOI: 10.1039/C29700000281
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