depicts the absorbance spectra represented by the Kubelka–Munk absorption function, f(R) = (1−R)2/2R, where
R is reflectance [15]. The inset shows the corresponding reflectance spectra. The optical absorption edge of these pigments depends on the composition, but all Ce1−x−yZrxBiyO2−y/2 pigments can absorb blue light efficiently, which is originated in the O2p–Ce4f charge transfer transitions. As a result, the color of the samples becomes yellow because blue is a complementary color to yellow. The optical gap energies (Eg) of the Table 2 L*a*b* color coordinate data and the optical gap energies (Eg) of the samples Sample L* a* b* Eg (eV) Ce0.72Zr0.09Bi0.19O1.91 80.5 −2.96 46.4 2.65 Ce0.56Zr0.24Bi0.20O1.90 86.4 0.50 57.4 2.60 Ce0.43Zr0.37Bi0.20O1.90 83.0 6.93 68.9 2.54
Ce0.43Zr0.37La0.20O1.90 97.7 −3.25 11.3 3.16 Praseodymium yellow 83.5 −3.28 70.3 2.42 Ce1−x−yZrxBiyO2−y/2 samples determined from the absorbance spectra are summarized in Table 2. In accordance with the
absorption spectra shown in Fig. 3, the energy decreased with the increase of Zr4+ content, and the lowest Eg value (2.54 eV) was obtained for Ce0.43Zr0.37Bi0.20O1.9. The L*a*b* color coordinate data of the Ce1−x−y ZrxBiyO2−y/2 pigments are also tabulated in Table 2 with that of the praseodymium yellow. The L* value is similar in all compositions, while the a* and the b* values depend on the Zr4+ content. The highest b* value is obtained at x = 0.37 and y = 0.20, and, as a result, the Ce0.43Zr0.37Bi0.20O1.9 pigment gives the most yellowish hue which is comparable with that of the commercial praseodymium yellow.
depicts the absorbance spectra represented by the Kubelka–Munk absorption function, f(R) = (1−R)2/2R, whereR is reflectance [15]. The inset shows the corresponding reflectance spectra. The optical absorption edge of these pigments depends on the composition, but all Ce1−x−yZrxBiyO2−y/2 pigments can absorb blue light efficiently, which is originated in the O2p–Ce4f charge transfer transitions. As a result, the color of the samples becomes yellow because blue is a complementary color to yellow. The optical gap energies (Eg) of the Table 2 L*a*b* color coordinate data and the optical gap energies (Eg) of the samples Sample L* a* b* Eg (eV) Ce0.72Zr0.09Bi0.19O1.91 80.5 −2.96 46.4 2.65 Ce0.56Zr0.24Bi0.20O1.90 86.4 0.50 57.4 2.60 Ce0.43Zr0.37Bi0.20O1.90 83.0 6.93 68.9 2.54Ce0.43Zr0.37La0.20O1.90 97.7 −3.25 11.3 3.16 Praseodymium yellow 83.5 −3.28 70.3 2.42 Ce1−x−yZrxBiyO2−y/2 samples determined from the absorbance spectra are summarized in Table 2. In accordance with theabsorption spectra shown in Fig. 3, the energy decreased with the increase of Zr4+ content, and the lowest Eg value (2.54 eV) was obtained for Ce0.43Zr0.37Bi0.20O1.9. The L*a*b* color coordinate data of the Ce1−x−y ZrxBiyO2−y/2 pigments are also tabulated in Table 2 with that of the praseodymium yellow. The L* value is similar in all compositions, while the a* and the b* values depend on the Zr4+ content. The highest b* value is obtained at x = 0.37 and y = 0.20, and, as a result, the Ce0.43Zr0.37Bi0.20O1.9 pigment gives the most yellowish hue which is comparable with that of the commercial praseodymium yellow.
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