Synthesis and Characterization of Ca(1–x)Eu(x)ZrO(3) as Environmentally Friendly Inorganic Yellow Pigments

[Image: see text] Eu(2+)-doped calcium zirconates, Ca(1–x)Eu(x)ZrO(3) (0 ≤ x ≤ 1), were synthesized as novel environmentally friendly inorganic yellow pigments by the conventional solid-state reaction method. The crystal structure, morphology, optical properties, and color were characterized. The Eu(2+)-doped samples strongly absorbed blue light in the wavelength range of 435–480 nm, which was caused by the 4f–5d allowed transition of Eu(2+). The color of the sample gradually became brilliant yellow with increasing the Eu(2+) content. Among the samples synthesized in this study, the brightest yellow color was obtained with the Ca(0.7)Eu(0.3)ZrO(3) (a* = +11.5 and b* = +70.7) sample. Compared with the commercially available praseodymium yellow pigment (a* = −3.28, b* = +70.3), the yellowness value (b*) of Ca(0.7)Eu(0.3)ZrO(3) was comparable and the redness value (a*) was higher. As a result, this pigment exhibited a reddish yellow color as compared with praseodymium yellow. In addition, this pigment was chemically stable. Therefore, the Ca(0.7)Eu(0.3)ZrO(3) pigment has the potential to become a novel environmentally friendly inorganic yellow pigment.