Ca^(2+)和Co^(2+)摩尔比对共掺杂LaAlO_(3)陶瓷红外辐射性能的影响  

Effect of Molar Ratio of Ca^(2+)and Co^(2+)on Infrared Radiation Properties of Co-doped LaAlO_(3)Ceramics

作　　者：王雪晴 王庆虎[1] 梁雄[1] 徐义彪[1] 朱天彬[1] 桑绍柏[1] 李亚伟[1] 陈义祥[2] 李永[2] 李江涛[2] WANG Xueqing;WANG Qinghu;LIANG Xiong;XU Yibiao;ZHU Tianbin;SANG Shaobai;LI Yawei;CHEN Yixiang;LI Yong;LI Jiangtao(Wuhan University of Science and Technology,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 430081,China;Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]武汉科技大学,省部共建耐火材料与冶金国家重点实验室,高温材料与炉衬技术国家地方联合工程研究中心,武汉430081 [2]中国科学院理化技术研究所,北京100190

出　　处：《硅酸盐学报》2022年第9期2380-2387,共8页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(U1904217、52102028);国家重点研发计划(2019YFC1904903-02)。

摘　　要：采用高温固相反应工艺制备n(Ca^(2+))/n(Co^(2+))(n为摩尔)共掺杂LaAlO_(3)陶瓷,研究了n(Ca^(2+))/n(Co^(2+))掺杂比例对LaAlO_(3)陶瓷[La_(1-x)Ca_(x)Al_(0.8)Co_(0.2)O_(3),0.25≤n(Ca^(2+))/n(Co^(2+))≤2.00]红外辐射性能的影响,探讨了LaAlO_(3)陶瓷发射率提高的机理。结果表明,n(Ca^(2+))/n(Co^(2+))共掺杂LaAlO_(3)陶瓷具有钙钛矿结构。在0.76~2.50μm波段,掺杂比例[0.25≤n(Ca^(2+))/n(Co^(2+))≤1.00]的增加有助于提升陶瓷的发射率,n(Ca^(2+))/n(Co^(2+))=1.00的陶瓷样品(La_(0.8)Ca_(0.2)Al_(0.8)Co_(0.2)O_(3))有最高的平均发射率(0.87);在2.50~14.0μm波段,所有n(Ca^(2+))/n(Co^(2+))共掺杂LaAlO_(3)陶瓷的平均发射率普遍高于0.94。发射率提高的原因为:n(Ca^(2+))/n(Co^(2+))共掺杂强化了自由载流子吸收、杂质能级吸收和晶格振动吸收。这种高发射红外陶瓷材料有望在热工装备的节能应用领域发挥作用。n(Ca^(2+))/n(Co^(2+))(n is mole)co-doped LaAlO_(3)ceramics were synthesized by a solid-phase reaction technique.The effect of n(Ca^(2+))/nCo^(2+)doping ratio on the infrared radiation performance of LaAlO_(3)ceramics(La_(1-x)Ca_(x)Al_(0.8)Co_(0.2)O_(3),0.25≤n(Ca^(2+))/n(Co^(2+))≤2.00)was investigated,and the mechanism for improving infrared radiation property was analyzed.The result reveals that n(Ca^(2+))/n(Co^(2+))co-doped LaAlO_(3)ceramics have a perovskite crystal structure.Increasing the doping ratio(0.25≤n(Ca^(2+))/n(Co^(2+))≤1.00)improves the emissivity in the wavelength range of 0.76-2.50μm.The ceramic specimen with n(Ca^(2+))/n(Co^(2+))of 1.00(La_(0.8)Ca_(0.2)Al_(0.8)Co_(0.2)O_(3))has the maximum average emissivity(0.87).In the 2.50-14.0μm band,the average emissivity of all n(Ca^(2+))/n(Co^(2+))co-doped LaAlO_(3)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.

关 键 词：铝酸镧陶瓷 钙钴共掺杂 红外辐射性能 发射率 

分 类 号：TQ75[化学工程]