Effect of Ca2+ and Mn2+ ions on the radiation properties of LaAlO3

The Ca 2+ -Mn 2+ doped LaAlO 3 was prepared by solid state reaction method, and the effects of different doping content of Ca 2+ and Mn 2+ ions on the infrared radiation properties of LaAlO 3 were investigated. The result showed that after doping Ca 2+ and Mn 2+ ions, the infrared radiation properties of LaAlO 3 significantly increased. When 40 mol% Ca 2+ and 50 mol% Mn 2+ ions were doped into LaAlO 3 , the average emissivity in the wavelength range of 1–22 µm was up to 0.90, which was higher than pure LaAlO 3 (0.71). The enhancement of infrared radiation properties of LaAlO 3 was mainly due to the decrease of band gap of LaAlO 3 , the increase of hole carriers absorption of energy, and the increase of lattice vibration absorption after doping Ca 2+ and Mn 2+ ions. Ca 2+ -Mn 2+ doped LaAlO 3 with high infrared radiation properties shows application prospect in the high temperature oxidation environment.