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稀土硼化物LaxCe1-xB6亚微米粉的制备及光吸收研究

包黎红 朝洛蒙 伟伟 特古斯

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稀土硼化物LaxCe1-xB6亚微米粉的制备及光吸收研究

包黎红, 朝洛蒙, 伟伟, 特古斯

Synthesis and optical absorption properties of LaxCe1-xB6 submicron powders

Bao Li-Hong, Chao Lu-Meng, Wei Wei, O. Tegus
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  • 以稀土氧化物La2O3和CeO2为稀土源, 以NaBH4为硼源在真空环境中通过固相反应成功制备出了分散性好的单相三元LaxCe1-xB6亚微米粉. 系统研究了掺杂元素La对CeB6物相, 微观结构及光吸收性能的影响. 实验结果表明, La元素的掺杂没有改变CeB6的物相和晶体结构, 而是无序替代了Ce原子晶位. 光吸收结果表明, 随着La掺杂量的增加LaxCe1-xB6分散液吸收谷波长从620 nm减小到610 nm出现了蓝移现象.
    According to original knowledge, lanthanum hexaboride (LaB6) as an excellent thermionic electron emitter is characterized by a low work function, a high emission density, and a high brightness. Recently, much attention has been drawn to its another excellent optical properties: strong light absorption in near infrared rays (NIR), and transparency in visible light (VL), which result from the free electron plasmon resonance. However, up to now the optical properties and syntheses of ternary rareflearth hexaborides have been very rarely reported in the literature. In this paper, ternary LaxCe1-xB6 submicron crystallines are successfully synthesized using a solid-state reaction, in which La2O3 and CeO2 are used as rareflearth sources and NaBH4 as boron sources in a continuous vacuum condition. Effects of La doping content on the LaxCe1-xB6 phase composition, microstructure, and optical absorption properties are investigated by X-ray diffraction, scanning electron microscope (SEM), and transmission electron microscope (TEM). It is found that all the synthesized samples are composed of CaB6-type single-phase alloy with a space group Pm3m at the reaction temperature of 1200 ℃ held by 2 h. The SEM results indicate that the cubic-shaped ternary LaxCe1-xB6 crystals with a mean size of 200 nm are obtained and the energy dispersive spectrometer results confirm that the La atoms are randomly distributed at the lattice sites of CeB6. High resolution transmission electron microscope images refleal the single-crystalline nature, and the FFT pattern indicates the lattice fringe d=0.42 nm which agrees well with the (100) crystal plane. EDS analysis of TEM also indicates the La element has been doped into CeB6. And the optical absorption result shows that the absorption valley of CeB6 is 62 nm. With increasing La doping content to x=0.6 and 0.8, the absorption valleys of La0.6Ce0.4B6 and La0.8Ce0.2B6 decrease to 613 and 610 nm respectively indicating the blueshifts of the wavelength of absorption valley From the view point of practical application, the tunable characteristic of LaxCe1-xB6 may extend the optical applications in improving the efficiency of organic photovoltaics, replacing the expensive gold and silver nanoparticles, which may have a good usage in optical filters.
    • 基金项目: 国家自然科学基金(批准号: 51302129)、内蒙古自治区重大基础研究开放课题(批准号: 20130902)和内蒙古师范大学高层次人才科研启动经费项目(批准号: 2013YJRC017) 资助的课题.
    • Funds: Project supported by the National Natural Science Foundation of China (Grant No. 51302129), the Open Major Basic Project of Inner Mongolia, China (Grant No. 20130902), and the High Level Talents Scientific Foundation of Inner Mongolia Normal University, China (Grant No. 2013YJRC017).
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    Jha M, Patra R, Ghosh S, Ganguli A K 2013 Solid State Commun. 153 35

    [2]

    Mandrus D, Sales B C, Jin R 2001 Phys. Rev. B 64 012302

    [3]

    Nishitani R, Aono M, TanaKa T, Kawai S, Iwasaki H, Oshima C, Nakamura S 1980 Surf. Sci. 95 341

    [4]

    Futamoto M, Nakazawa M, Kawabe U 1980 Surf. Sci. 100 470

    [5]

    Rokuta E, Yamamoto N, Hasegawa Y, Trenary M, Nagao T, Oshima C, Otani S 1998 Surf. Sci. 416 363

    [6]

    Zhang H, Zhang Q, Zhao G P, Tang J, Zhou O, Qin L C 2005 J Am. Chem. Soc. 127 13120

    [7]

    Lai B H, Chen D H 2013 Acta Biomaterialia 9 7556

    [8]

    Lai B H, Chen D H 2013 Acta Biomaterialia 9 7573

    [9]

    Schelm S, Smith G B 2003 Appl. Phys. Lett. 82 4346

    [10]

    Takede H, Kuno H, Adachi K 2008 J. Am. Ceram. Soc. 91 2897

    [11]

    Yuan Y F, Zhang L, Hu L J, Wang W, Min G H 2011 J. Solid State Chem. 184 3364

    [12]

    Xiao L H, Su Y C, Zhou X Z, Chen H Y, Tan J, Hu T, Yan J, Peng P 2012 Appl. Phys. Lett. 101 041913

    [13]

    Kim S S, Na S I, Jo J, Kim D Y, Nah Y C 2008 Appl. Phys. Lett. 93 073307

    [14]

    Huang Q, Wang J, Cao L R, Sun J, Zhang X D, Geng W D, Xiong S Z, Zhao Y 2009 Acta Phys. Sin. 58 1980 (in Chinese) [黄茜, 王京, 曹丽冉, 孙建, 张晓丹, 耿卫东, 熊绍珍, 赵颖 2009 物理学报 58 1980]

    [15]

    Li R, Zhu Y B, Di Y, Liu D X, Li B, Zhong W 2013 Acta Phys. Sin. 62 198101 (in Chinese) [李娆, 朱亚彬, 狄月, 刘冬雪, 李冰, 钟韦 2013 物理学报 62 198101]

    [16]

    Bao L H, Narengerile, Tegus O, Zhang X, Zhang J X 2013 Acta Phys. Sin. 62 196105 (in Chinese) [包黎红, 那仁格日乐, 特古斯, 张忻, 张久兴 2013 物理学报 62 196105]

    [17]

    Bao L H, Tegus O, Zhang J X, Zhang X, Huang Y K 2013 J. Alloys. Comp. 558 39

    [18]

    Bao L H, Wurentuya, Wei W, Tegus O 2014 Materials Characterization 97 69

    [19]

    Bao L H, Wurentuya, Wei W, Li Y J, Tegus O 2014 J. Alloys. Comp. 617 235

    [20]

    Sato Y, Terauchi M, Mukai M, Kaneyama T, Adachi K 2011 Ultramicroscopy 111 1381

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出版历程
  • 收稿日期:  2014-10-16
  • 修回日期:  2014-11-29
  • 刊出日期:  2015-05-05

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