Preparation of environmentally friendly high-emissivity Ca2+-Fe3+ co-doped LaAlO3 ceramic |
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Authors: | Qu Wang Senwang Yan Binbin Dong Yifan Zhang Qi Zhang Penghui Du Gang Wang |
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Affiliation: | 1. State Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd, Luoyang, China;2. Luoyang Institute of Science and Technology, Luoyang, China |
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Abstract: | Ca2+-Cr3+ co-doped LaAlO3 is an excellent ceramic material with high emissivity; however, it is harmful to the environment because of the presence of Cr3+ ions. In this study, Ca2+-Fe3+ co-doped LaAlO3 ceramic materials were successfully prepared via a high-temperature solid-state reaction. The emissivity of Ca2+-Fe3+ co-doped LaAlO3 was 0.91, which is approximately equal to that of Ca2+-Cr3+ co-doped LaAlO3. To compensate for the lack of data on the thermophysical properties of doped LaAlO3 high-emissivity ceramics, the thermal expansion coefficients and thermal conductivities of LaAlO3 doped with Ca2+-Fe3+ or Ca2+-Cr3+ were investigated. The thermal conductivities of La0.9Ca0.1Al0.9Fe0.1O3 and La0.9Ca0.1Al0.9Cr0.1O3 at 1200°C were 3.802 and 3.707 W·m−1·K−1, respectively. The thermal expansion coefficients of La0.9Ca0.1Al0.9Fe0.1O3 and La0.9Ca0.1Al0.9Cr0.1O3 at 1200°C were 11.49×10−6 and 11.41×10−6 K−1, respectively. These results indicate that Ca2+-Fe3+ co-doped LaAlO3 exhibits great potential as a new generation of environmentally friendly near-infrared radiating materials in the field of energy efficiency. |
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Keywords: | co-doping LaAlO3 infrared emissivity thermal conductivity thermal expansion coefficient |
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