Synthesis by a Coprecipitation Method and Evaluation of Optical Properties of Ceria-Zirconia Series Materials

Fe-doped ceria-zirconia Zr x Ce 0.95-x Fe 0.05 O 2-δ (where x=0, 0.20, 0.40, 0.60, 0.80, and 0.95), and Tb-doped ceria-zirconia Zr x Ce 0.95-x Tb 0.05 O 2-δ (where x=0, 0.20, 0.40, 0.60, 0.80, and 0.95) powder samples were synthesized by a coprecipitation method and heated at 900oC and 1230oC. The samples were characterized by XRD, colorimetric assessment and UV-Vis diffuse reflectance spectroscopy. Furthermore, the color glazes obtained by adding the samples to the basic glaze were heated at 1230oC in air, and evaluated by colorimetric assessment. In Fe-doped ceria zirconia samples heated at 900oC, the red color varied to orange and yellow with increasing x in Zr x Ce 0.95-x Fe 0.05 O 2-δ . However, the glazes containing them (with Zr) changed from warm color into pale like celadon. In Tb-doped ceria zirconia samples, the dark brown color varied to yellow-brown and orange with increasing x in Zr x Ce 0.95-x Tb 0.05 O 2-δ . The glazes containing them showed orange or pale yellow color. These warm colored materials show high durability against high temperature and environmental friendly properties, so the application as ceramic pigments can be expected.