The low infrared emissivity of Ce _1-xY _xO _2-x/2 samples at high-temperature contributed by enhanced conductivity

摘要

The Ce_(1-x)Y_(x)O_(2-x/2)samples were synthesized with different doping amount by solid state reaction method. Phase structures of the samples were analyzed and characterized by XRD. The effects of different doping amount on infrared emissivity properties at 3-5μm wavebands were investigated systematically. It is found that the powder with doping molality of x=0.2 exhibits the lowest infrared emissivity value ca. 0.21 when the test temperature is 600 °C. The mechanism for the low infrared emissivity is explored thoroughly. The reduction of infrared emissivity with increasing temperature is ascribed to the enhancement of electrical conductivity. Our results suggest that Ce_(1-x)Y_(x)O_(2-x/2)powder with x=0.2 is a potential candidate for stealth material of aircraft engines.