HU Feiyang, LI Yueming, WANG Zhumei, SHEN Zongyang, HONG Yan
(1. School of Materials Science and Engineering, Jingdezhen Ceramic University, Jingdezhen 333403, Jiangxi, China; 2. China National Light Industry Key Laboratory of Functional Ceramic Materials, Jingdezhen 333403, Jiangxi, China; 3. Energy Storage and Conversion Ceramic Materials Engineering Laboratory of Jiangxi Province, Jingdezhen 333403, Jiangxi, China)
Abstract: In this study, Ba2+-Nd3+ Co-doped γ-Ce2S3 (γ-[Ba, Nd]-Ce2S3) bright red pigments were synthesized by using co-precipitation method with a composition of n(Ba)/n(Ce1-xNdx) = 0.1 (x =0, 0.01, 0.03, 0.05, 0.07 and 0.10). The corresponding vulcanized red pigments, γ-[Ba, Nd]-Ce2S3 (S.Ndx), were prepared using CS2 as the sulfur source at 850 ℃ for 150 min. The effect of the content of Nd3+ on phase composition, chromaticity, and antioxidant properties of the Ba2+-Nd3+ co-doped γ-Ce2S3 was systematically studied, by using FE-SEM, EDS, XRD, HR-TEM, XPS, CIELAB colorimetry and TG-DSC. It was found that mpure γ phase S.Ndx can be obtained at 850 ℃, when x was varied from 0 to 0.10. With increasing content of Nd3+, the band gap of γ-[Ba, Nd]-Ce2S3 was increased from 2.06 to 2.14 eV, resulting in color change from red to red-orange. Chromaticity value of the pigments was increased from L* = 32.95, a* = 30.39, b* = 24.34 (S.Nd0.00) to L* = 34.89, a* = 37.91, b* = 38.19 (S.Nd0.05), and then decreased, indicating that Ba2+-Nd3+ co-doping led to an effective increase in the value of chromaticity. The S.Nd0.05 sample still exhibited pure γ phase, with a promising chromaticity (L* = 22.31, a* = 23.87, b* = 27.62) after heat treatment at 440 ℃ for 10 min in air, strongly suggesting that Ba2+-Nd3+ co-doping could be an effective way to increase the antioxidation behavior of the γ-[Ba, Nd]-Ce2S3 red pigment.
Key words: γ-Ce2S3; bright red pigment; Co-precipitation; Ba2+-Nd3+ co-doping