Preparation of Cr_2O_3-based pigments with high NIR reflectance via thermal decomposition of CrOOH

作     者：梁书婷 张红玲 雒敏婷 刘红霞 白玉兰 徐红彬 张懿 Shu-ting LIANG;Hong-ling ZHANG;Min-ting LUO;Hong-xia LIU;Yu-lan BAI;Hong-bin XU;Yi ZHANG

作者机构：中国科学院过程工程研究所湿法冶金清洁生产技术国家工程实验室北京100190 中国科学院绿色过程与工程重点实验室北京100190 中国科学院大学北京100049 山东省建筑科学研究院济南250031 青岛农业大学化学与制药学院青岛266109 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2015年第25卷第8期

页      面：2646-2652页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 

基　　金：Project(11204304)supported by the National Natural Science Foundation of China Project(2013CB632600)supported by the National Basic Research Program of China Project(2011AA060702)supported by the National High-tech Research and Development Program of China 

主　　题：CrOOH CrOOH cool pigments NIR reflectance 

摘      要：In order to reduce greenhouse gas emission and urban heat island mitigation, pure and titanium（Ti）-doped Cr2O3 cool pigments were prepared via the thermal decomposition of CrOOH. The result reveals that the pure Cr2O3 pigment presents both a high near-infrared reflectance and excellent yellowish-green color. Meanwhile, titanium was doped to improve the NIR reflectance and strengthen the color. The color of the designed pigments was brighter, and most importantly, the NIR reflectance increased from 84.04% to 91.25% with increasing Ti content from 0 to 0.006% （mole fraction）. However, excessive doping of Ti4＋ for Cr3＋ in Cr2O3 （x（Ti）≥0.008%） decreased the NIR reflectance. One possible reason is that the conductivity type of the Cr2？xTixO3＋δ changed from p-type conduction to n-type conduction with increasing Ti content, accompanied by the change of the electrical resistivity and the NIR reflectance. The prepared yellowish-green Cr2O3 pigments have a great potential for extensive applications in construction and military.