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Ce3+和Fe3+共掺杂CaAl2O4高近红外反射颜料的制备与表征
作者：肖雷，包维维，郝晓丽，邓志峰，蒋鹏
（陕西理工大学 矿渣综合利用环保技术国家与地方联合工程实验室，陕西 汉中 723000）
摘要：离子掺杂能够调谐颜料的反射性能和颜色。采用溶胶-凝胶法制备了一系列新型低毒的Fe3+、Ce3+共掺杂Ca1-xCexAl2-yFeyO4（x=0、0.15；y=0.15、0.25、0.35）高近红外反射无机颜料。采用X-射线衍射仪（XRD）、扫描电子显微镜（SEM）、紫外/可见/近红外光谱仪及Color CIE色度分析软件对所合成复合颜料的晶体结构、微观形貌、光学性质（反射性能）和颜色等进行了表征。XRD分析表明，煅烧温度为1100 ℃时，所合成的样品为磷石英结构；光学性能分析表明，随着Fe3+掺杂量的增加，颜料的颜色由白色逐渐变为黄色再变为深棕色。Fe3+、Ce3+共掺杂所制备的颜料在780~2500 nm波长范围内具有较高的近红外反射率（NIR≥61.5%）。该Ca1-xCexAl2-yFeyO4“冷”颜料粉体在建筑涂料等方面具有广阔的应用前景。
关键词：CaAl2O4；溶胶-凝胶法；离子共掺杂；高近红外反射；“冷”颜料
中图分类号：TU56+.2 文献标识码：A 文章编号：1001-702X（2022）02-0036-05
Preparation and characterization of near-infrared reflective pigments based on Ce3+ and Fe3+ co-doped CaAl2O4
XIAO Lei，BAO Weiwei，HAO Xiaoli，DENG Zhifeng，JIANG Peng
（National & Local Joint Engineering Laboratory for Slag Comprehensive Utilization and Environmental Technology，Shaanxi University of Technology，Hanzhong 723000，China）
Abstract：Ion doping can tune the reflectivity and color properties of pigments. In this paper，a series of novel low-toxic high near-infrared reflectance Ca1-xCexAl2-yFeyO4（x=0、0.15；y=0.15、0.25、0.35） inorganic pigment co-doped with Fe3+ and Ce3+ was prepared by sol-gel method. The crystal structure，micro-structure，optical properties（reflectance properties） and color performance of the synthesized composite were characterized by X-ray diffraction（XRD），Scanning electron microscope（SEM），UV/VIS/NIR spectroscopy and Color CIE chromaticity analysis software. X-ray diffraction analysis demonstrates that the synthesized sample is phosphorus quartz structure when the calcination temperature is 1100 ℃. The analysis of optical properties shows that with the increase of the doping amount of Fe3+，the color of the pigment sample gradually changes from white to yellow and then to dark brown. Fe3+ and Ce3+ co-doped pigments possess high near-infrared solar reflectance（NIR≥61.5%） in the wavelength range of 780~2500 nm. Therefore，the synthesized Ca1-xCexAl2-yFeyO4 powder have great promising in serving as cool pigments for architectural coatings.
Key words：CaAl2O4，sol-gel method，ion co-doping，high near infrared reflection，"cool" pigments