New Yellow Ceramic Pigment Based on Codoping Pyrochlore‐type Y ₂ Ti ₂ O ₇ with V ⁵⁺ and Ca ²⁺

A new yellow pigment with the pyrochlore structure Ca x Y 2− x V x Ti 2− x O 7 was prepared as a substitute for the decreasing variety of available yellow ceramic pigments due to the severe regulation of toxic lead and cadmium. The solubility limit of vanadium in this pigment was found to be 1.5 wt% as V 2 O 5 or 0.13 as x in the above formula expression. Characterization of vanadium in the vanadium pyrochlore yellow pigment by electron spectroscopy for chemical analysis and electron spin resonance showed that the oxidation state of vanadium was V 5+ and its yellow color mostly originated from V 5+ substituted for Ti 4+ . Comparison of color characteristics of Ca x Y 2− x V x Ti 2− x O 7 with those of commercial V–SnO 2 and V–ZrO 2 revealed that Ca x Y 2− x V x Ti 2− O 7 had better color strength and brightness than the commercial pigments.