New Yellow Ceramic Pigment Based on Codoping Pyrochlore-type Y2Ti2O7 with V5+ and Ca2+ |
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| Authors: | Shingo Ishida Feng Ren Nobuyuki Takeuchi |
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| Affiliation: | Department of Chemistry and Materials Technology, Kyoto Institute of Technology, Matsugasaki, Kyoto 606, Japan |
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| Abstract: | A new yellow pigment with the pyrochlore structure CaxY2? x V x Ti2? x O7 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 V2O5 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 V5+ and its yellow color mostly originated from V5+ substituted for Ti4+. Comparison of color characteristics of CaxY2? x V x Ti2? x O7 with those of commercial V–SnO2 and V–ZrO2 revealed that Ca x Y2? x V x Ti2?O7 had better color strength and brightness than the commercial pigments. |
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