| Synthesis,thermionic emission and magnetic properties of(NdxGd1-x)B6 |
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| 作者姓名： | 包黎红 张久兴 周身林 特古斯 |
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| 作者单位： | Key Laboratory of Advanced Functional Materials of Ministry of Education,College of Materials Science and Engineering,Beijing University of Technology Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials,College of Physics and Electron Information,Inner Mongolia Normal University |
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| 基金项目： | 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.
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| 关 键 词： | rare-earth hexaborides spark plasma sintering emission property |
| 收稿时间： | 2010-11-27 |
Synthesis, thermionic emission and magnetic properties of (NdxGd1-x)B6 |
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| Bao Li-Hong,Zhang Jiu-Xing,Zhou Shen-Lin and Tegus.Synthesis,thermionic emission and magnetic properties of(NdxGd1-x)B6[J].Chinese Physics B,2011,20(5):58101-058101. |
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| Authors: | Bao Li-Hong Zhang Jiu-Xing Zhou Shen-Lin and Tegus |
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| Affiliation: | Key Laboratory of Advanced Functional Materials of Ministry of Education, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China;Key Laboratory of Advanced Functional Materials of Ministry of Education, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China;Key Laboratory of Advanced Functional Materials of Ministry of Education, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China;Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials, College of Physics and Electron Information, Inner Mongolia Normal University, Hohhot 010022, China |
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| 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. |
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| Keywords: | rare-earth hexaborides spark plasma sintering emission property |
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