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.
出处
《过程工程学报》
CAS
CSCD
北大核心
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)
关键词
热辐射
红外发射率
钙钛矿
铁酸镧
掺杂
thermal radiation
infrared emissivity
perovskite
LaFeO3
doping
