Novel Cu2+-Fe3+co-doped LaAlO3 ceramic with high infrared radiation performance

作者：Wang, Ke; Ding, Cuijiao; Wang, Qinghu^*; Luo, Wei; Huang, Liang^*; Xu, Yibiao; Liang, Xiong; Sang, Shaobai; Pan, Liping; Li, Yawei; Zhang, Haijun; Li, Jiangtao

来源：Journal of Alloys and Compounds, 2024, 973: 172876.

DOI：10.1016/j.jallcom.2023.172876

• LaAlO3
• Cu2+-Fe3+co-doping
• Infrared radiation performance

A novel high-emissivity Cu2+-Fe3+ co-doped LaAlO3 ceramic has been prepared by a solid-phase reaction technology at high temperature. The effect of the doping ratio (0.25 <= n(Cu2+)/n(Fe3+)<= 1.0) on the infrared radiation (IR) properties of LaAlO3 ceramics was investigated systematically, and the mechanism of enhanced emissivity was revealed. The result shows that Cu2+-Fe3+ co-doping can substantially improve the IR performance of LaAlO3 ceramics. In the range of 0.25 <= n(Cu2+)/n(Fe3+) <= 0.75, the emissivity of LaAlO3 ceramics increases steadily with the doping ratio. When n(Cu2+)/n(Fe3+) = 0.75, the specimen has the largest emissivity of 0.83 and 0.82 in the 1.0-2.5 mu m and 2.5-14 mu m bands respectively, achieving an enhancement of 315% and 116% than pure LaAlO3. The improved IR properties of Cu2+-Fe3+ co-doped LaAlO3 ceramics can be attributed to enhanced impurity energy level absorption, free carrier ion absorption and lattice vibration absorption. These high emissivity Cu2+-Fe3+ co-doped LaAlO3 ceramics are non-toxic, non-hazardous and low-cost, exhibiting promising application potential in the field of energy-saving for thermal equipment.