期刊
CERAMICS INTERNATIONAL
卷 38, 期 5, 页码 4009-4016出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2012.01.057
关键词
Powders: solid state reaction; Spectroscopy; Optical properties; CeO2; Coloration of plastics
资金
- Council of Scientific and Industrial Research
Ecological red pigments Ce0.95Pr0.05-xMxO2 (M = Mn, Si) have been synthesized by conventional solid-state route and characterized by X-ray diffractometer, scanning electron microscope and UV-vis spectroscopy. Mn4+/Si4+ was incorporated into the CeO2-PrO2 system to tune the color properties of the pigments by shifting the optical absorption edge. Si4+ substitution blue shifts the absorption edge of Pr-doped ceria and shows bright reddish brown color. Mn4+ substitution stabilizes the absorption edge and exhibits dark brown hue. The coloring mechanism is based on the shift of charge transfer band of CeO2 to higher wavelength by co-substitution of Pr4+ and tetravalent metal ions in ceria. Si co-doped pigments possess smaller particles and hence exhibit more lightness compared to Mn co-doped samples. The reddish brown pigments exhibit very good coloring performance in polymer matrix. These Ce0.95Pr0.05-xMxO2 (M = Mn, Si) pigments have potential to be used as ecological red pigments for coloration of plastics. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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