多元稀土硼化物La1-xEuxB6纳米粉末的制备及光学性能研究

本研究首次采用钙热还原-酸浸法(CTR&AL)成功制备了La_1-xEu_x B₆纳米粉末，研究了Eu掺杂对La_1-xEu_x B₆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-xEu_x B₆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-xEu_x B₆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-xEu_...

Fabrication and Optical Properties of Nanocrystalline Multi Rare Earth Hexaborides La1-xEuxB6 powders

In this study, nanocrystalline La1-xEuxB6 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 La1-xEuxB6 and the mechanism were also systematically investigated. The XRD, FE-SEM and TEM analyses all confirm that the nanocrystalline La1-xEuxB6 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 La1-xEuxB6 shifts from 595 nm to 825 nm with increasing Eu-doping content, indicating a "red shift" phenomenon of transmission light. 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 La1-xEuxB6 transmission light.