利用Ca2+掺杂增强钙钛矿型LaFeO3的红外发射率  

Highly Enhanced Infrared Emissivity of Perovskite LaFeO3 by Ca2+ Doping

作　　者：韩召 刘鹏飞[1] 李小伟 卢卫华 

机构地区：[1]安徽工业大学冶金工程学院,安徽马鞍山243032 [2]安徽工业大学冶金减排与资源综合利用教育部重点实验室,安徽马鞍山243032

出　　处：《过程工程学报》2018年第1期154-158,共5页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:51372255);钢铁冶金新技术国家重点实验室开放研究项目(编号:201601)

摘　　要：采用固相反应法,在空气气氛中制备了纯LaFeO3和Ca2＋掺杂的LaFeO3,对其在近红外波段的发射率进行了研究和比较.结果表明,掺杂10mol%Ca2＋的La0.9Ca0.1FeO3在35mm波段的红外发射率达0.92,比纯LaFeO3提高了119%.原因为Ca2＋掺杂进入LaFeO3的晶格后,在其半导体带隙中引入Fe4＋杂质能级,形成了跃迁激活能仅需0.1 eV的Fe3＋？Fe4＋小极化子吸收带,增强了LaFeO3的红外辐射性能.Pure LaFeO3 and Ca2＋-doped LaFeO3 ceramics were prepared by solid-state reaction in air atmosphere, and their near-infrared（NIR） emissivity characteristics were investigated and compared with each other. The results revealed that 10 mol% Ca2＋-doped LaFeO3, namely La0.9Ca0.1FeO3, exhibited a NIR emissivity as high as 0.92 in the wavelength region of 35 mm, which was 119% higher than that of pure LaFeO3. The reason was Ca2＋-doped LaFeO3 mainly attributed to the electronic transition absorption of Fe3＋？Fe4＋ small polarons introduced by Ca2＋ doping.

关 键 词：热辐射 红外发射率 钙钛矿 铁酸镧 掺杂 

分 类 号：TQ174[化学工程—陶瓷工业]