抄録
We investigated the optical properties for CeO2-ZrO2 system powders synthesized by coprecipitation method and heated at 900°C. For x=0.4 to 0.7 in ZrxCe1-xO2, XRD revealed two phases existed: Ce-rich CeO2-ZrO2 solid solution with cubic fluorite structure and Zr-rich CeO2-ZrO2 solid solution with tetragonal pseudo-fluorite structure. For x=0.2 to 0.8, b∗ values showed about 40, and vivid yellow powders were obtained. Diffuse reflectance spectra of the powder in the UV region showed the broad shoulder-type band at 320-350 nm, which is assigned to interband transitions in CeO2. The Zr-doping in CeO2 extended the light absorption range by the interband transitions into visible light region. The light with wavelengths corresponding to purple and blue were absorbed, so that the powders showed yellow corresponding to the complementary color.
