Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1636711 | Transactions of Nonferrous Metals Society of China | 2015 | 7 Pages |
Abstract
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)â¤0.008%) decreased the NIR reflectance. One possible reason is that the conductivity type of the Cr2âxTixO3+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.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Shu-ting LIANG, Hong-ling ZHANG, Min-ting LUO, Hong-xia LIU, Yu-lan BAI, Hong-bin XU, Yi ZHANG,