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Hafnium(IV) oxide is used as Intermediates, Paint additives and coating additives, metal Products. And it is also used in optical coatings, as a refractory material in the insulation of such devices as thermocouples.
Taketatsu, T.; Toriumi, N. Synergic solvent extraction of rare earthsI Spectrophotometric investigation of holmium-and erbium-TTA-TOPO complexes with perchlorate ion. Journal of Inorganic and Nuclear Chemistry. 1969, 31, (7), 2235-2246.