多元稀土硼化物La_(1-x)Eu_(x)B_(6)纳米粉末的制备及光学性能研究  

Fabrication and Optical Properties of Nanocrystalline Multi Rare Earth Hexaborides La_(1-x)Eu_(x)B_(6)Powder

作　　者：赵瑞山 黄美松 刘华 杨露辉 罗天纵 郭利平 刘维 Zhao Ruishan;Huang Meisong;Liu Hua;Yang Luhui;Luo Tianzong;Guo Liping;Liu Wei(Hunan Institute for Rare Earth Metal Materials Research Co.,Ltd,Changsha 410126,China;Hunan Key Laboratory for Rare Earth Functional Materials,Changsha 410126,China;Central South University,Changsha 410083,China)

机构地区：[1]湖南稀土金属材料研究院有限责任公司,湖南长沙410126 [2]稀土功能材料湖南省重点实验室,湖南长沙410126 [3]中南大学,湖南长沙410083

出　　处：《稀有金属材料与工程》2023年第1期153-159,共7页Rare Metal Materials and Engineering

基　　金：湖南省科技创新计划项目(2017TP1031)。

摘　　要：本研究首次采用钙热还原-酸浸法(CTR&AL)成功制备了La_(1-x)Eu_(x)B_(6)纳米粉末,研究了Eu掺杂对La_(1-x)Eu_(x)B_(6)结构、光学性能的影响规律及作用机理。XRD、FE-SEM及TEM分析结果确认纳米La_(1-x)Eu_(x)B_(6)为CsCl型简单立方单相结构,结晶性良好,粉末颗粒具有立方形貌,平均晶粒尺度为40 nm。光吸收结果表明随着Eu含量的增加,纳米La_(1-x)Eu_(x)B_(6)透射光波长从595 nm增大至825 nm,产生“红移”现象,且Eu掺杂引起LaB6近红外区吸收光谱的增强与展宽。第一性原理计算结果揭示了Eu掺杂引起LaB6近费米能级能带局域性加强,导带中的传导电子数量减少,进而导致其等离激元共振频率能量降低,定性解释了纳米La_(1-x)Eu_(x)B_(6)透射光波长连续可调谐性。In this study,nanocrystalline La_(1-x)Eu_(x)B_(6)powders were successfully fabricated using a novel calcium thermal reduction and acid leaching technique(CTR&AL)for the first time,and the effect of Eu-doping on the structure and optical properties of La_(1-x)Eu_(x)B_(6)and the mechanism were also investigated.XRD,FE-SEM and TEM analyses all confirm that the nanocrystalline La_(1-x)Eu_(x)B_(6)exhibits a single-phase CsCl-type cubic structure,good crystallinity and a cubic morphological characterization with an average grain size of 40 nm.The results of optical absorption show that the transmission light wavelength of nanocrystalline La_(1-x)Eu_(x)B_(6)shifts from 595 nm to 825 nm with increasing Eu-doping content,indicating that a“red shift”phenomenon of transmission light occurs.And the Eu doping causes the enhancement and broadening of absorption spectrum of LaB6 in the near-infrared region.Furthermore,the first principle calculations reveal that the Eu-doping strengthens the localization of energy bands at near Fermi level of LaB6 and reduces the number of conduction electrons in the conduction band,which in turn decreases its plasmon resonance frequency energy,which qualitatively explains the continuous tunable characteristic of La_(1-x)Eu_(x)B_(6)transmission light.

关 键 词：La_(1-x)Eu_(x)B_(6) 纳米粉末 结构 光学性能 

分 类 号：TQ174.758.12[化学工程—陶瓷工业]