Enhanced infrared radiation of LaAlO3 ceramics via Co2+doping

Infrared radiation (IR) ceramics are generally recognized as energy-saving materials for thermal equipment. In this work, as novel infrared radiation ceramics, Co2+-doped LaAlO3 ceramics were synthesized via a solid-phase reaction method, and the influence of the Co2+ doping concentration on the infrared emissivity of ceramics was systematically investigated. The original Al element position was replaced by Co in Co2+-doped LaAlO3, leading to lattice distortion, oxygen vacancy generation and the "Co2+-> Co3+" transformation. The increase in doped Co content leads to enhanced impurity absorption, free carrier absorption and lattice vibration absorption, which significantly improve infrared emissivity. The average emissivity values in the 0.76-2.5 mu m and 2.5-14 mu m bands of the LaAl0.6Co0.4O3-delta specimen (40 mol% Co) are 0.89 and 0.86 respectively, which are 324% and 28% higher than those of pure LaAlO3. This novel Co2+-doped LaAlO3 ceramic with high infrared emissivity has significant application prospects for energy-saving applications of thermal equipment.