Effect of Molar Ratio of Ca2+ and Co2+ on Infrared Radiation Properties of Co-doped LaAlO3 Ceramics

被引：0

作者：

Wang X. ^{[1
]}

Wang Q. ^{[1
]}

Liang X. ^{[1
]}

Xu Y. ^{[1
]}

Zhu T. ^{[1
]}

Sang S. ^{[1
]}

Li Y. ^{[1
]}

Chen Y. ^{[2
]}

Li Y. ^{[1
]}

Li J. ^{[2
]}

机构：

[1] The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan

[2] Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing

来源：

Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | 2022年 / 50卷 / 09期

关键词：

Calcium and cobalt co-doping; Emissivity; Infrared radiation property; Lanthanum aluminate ceramics;

D O I：

10.14062/j.issn.0454-5648.20220016

中图分类号：

学科分类号：

摘要：

n(Ca2+)/n(Co2+)(n is mole) co-doped LaAlO3 ceramics were synthesized by a solid-phase reaction technique. The effect of n(Ca2+)/nCo2+ doping ratio on the infrared radiation performance of LaAlO3 ceramics (La1-xCaxAl0.8Co0.2O3, 0.25≤n(Ca2+)/n(Co2+)≤2.00) was investigated, and the mechanism for improving infrared radiation property was analyzed. The result reveals that n(Ca2+)/n(Co2+) co-doped LaAlO3 ceramics have a perovskite crystal structure. Increasing the doping ratio (0.25≤n(Ca2+)/n(Co2+)≤1.00) improves the emissivity in the wavelength range of 0.76-2.50 μm. The ceramic specimen with n(Ca2+)/n(Co2+) of 1.00 (La0.8Ca0.2Al0.8Co0.2O3) has the maximum average emissivity (0.87). In the 2.50-14.0 μm band, the average emissivity of all n(Ca2+)/n(Co2+) co-doped LaAlO3 ceramics is generally greater than 0.94. The improvement of emissivity can be attributed to the enhancement of free carrier absorption, impurity absorption and lattice vibration absorption. This novel infrared ceramic with a high emissivity has promising prospects for energy-saving applications of thermal equipment. © 2022, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved.

引用

页码：2380 / 2387

页数：7

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