中国物理B ›› 2011, Vol. 20 ›› Issue (5): 58101-058101.doi: 10.1088/1674-1056/20/5/058101

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Synthesis, thermionic emission and magnetic properties of (NdxGd1-x)B6

特古斯1, 包黎红2, 张久兴2, 周身林2   

  1. (1)Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials, College of Physics and Electron Information, Inner Mongolia Normal University, Hohhot 010022, China; (2)Key Laboratory of Advanced Functional Materials of Ministry of Education, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
  • 收稿日期:2010-11-27 修回日期:2011-01-17 出版日期:2011-05-15 发布日期:2011-05-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 50871002).

Synthesis, thermionic emission and magnetic properties of (NdxGd1-x)B6

Bao Li-Hong(包黎红)a), Zhang Jiu-Xing(张久兴) a)†, Zhou Shen-Lin(周身林)a), and Tegus(特古斯) b)   

  1. a Key Laboratory of Advanced Functional Materials of Ministry of Education, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China; b Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials, College of Physics and Electron Information, Inner Mongolia Normal University, Hohhot 010022, China
  • Received:2010-11-27 Revised:2011-01-17 Online:2011-05-15 Published:2011-05-15
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 50871002).

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摘要： Polycrystalline rare-earth hexaborides (NdxGd1-x)B6 (x = 0, 0.2, 0.6, 0.8, 1) were prepared by the reactive spark plasma sintering (SPS) method using mixed powder of GdH2, NdH2 and B. The effects of Nd doping on the crystal structure, the grain orientation, the thermionic emission and the magnetic properties of the hexaboride were investigated by X-ray diffraction, electron backscattered diffraction and magnetic measurements. It is found that all the samples sintered by the SPS method exhibit high densities (> 95%) and high values of Vickers hardness (2319 kg/mm2). The values are much higher than those obtained in the traditional method. With the increase of Nd content, the thermionic emission current density increases from 11 to 16.30 A/cm2 and the magnetic phase transition temperature increases from 5.85 to 7.95 K. Thus, the SPS technique is a suitable method to synthesize the dense rare-earth hexaborides with excellent properties.

关键词: rare-earth hexaborides, spark plasma sintering, emission property

Abstract: Polycrystalline rare-earth hexaborides (NdxGd1-x)B6 (x = 0, 0.2, 0.6, 0.8, 1) were prepared by the reactive spark plasma sintering (SPS) method using mixed powder of GdH2, NdH2 and B. The effects of Nd doping on the crystal structure, the grain orientation, the thermionic emission and the magnetic properties of the hexaboride were investigated by X-ray diffraction, electron backscattered diffraction and magnetic measurements. It is found that all the samples sintered by the SPS method exhibit high densities (> 95%) and high values of Vickers hardness (2319 kg/mm2). The values are much higher than those obtained in the traditional method. With the increase of Nd content, the thermionic emission current density increases from 11 to 16.30 A/cm2 and the magnetic phase transition temperature increases from 5.85 to 7.95 K. Thus, the SPS technique is a suitable method to synthesize the dense rare-earth hexaborides with excellent properties.

Key words: rare-earth hexaborides, spark plasma sintering, emission property

中图分类号:  (Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides))

  • 81.05.Je
61.66.Fn (Inorganic compounds) 75.50.Ee (Antiferromagnetics)