The effect of Al3+ doping on the infrared radiation and thermophysical properties of SrZrO3 perovskites as potential low thermal infrared material

A series of Al3+-doped SrZrO3 perovskite powders with low infrared emissivity were prepared. The doping-effect of Al3+ on infrared radiation ability and thermophysical properties was investigated in detail by theoretical and experimental methods. As a result, Al3+-doped SrZrO3 perovskite's infrared emissivity is related to its electronic structure and particle morphology. It can be adjusted by the Al3+-doped concentration. The SrZr0.86Al0.14O2.935 powder with stronger electronic conductivity and flake particles has the lowest infrared emissivity with 0.256 in 3-5 μm waveband at 590 °C and 0.383 in 8-14 μm waveband at 550 °C. Al3+-doped SrZrO3 perovskites still maintain ideal thermal stability and low thermal conductivity above 800 °C. Base on both low infrared emissivity and thermal conductivity, Al3+-doped SrZrO3 tablets exhibited weaker thermal radiation intensity in the high-temperature condition and might be the potential low thermal infrared materials servicing under extreme temperature in the future.