| Ba掺杂对稀土硼化物GdB6结构,晶粒取向和热发射性能的影响（英文） |
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| 引用本文： | 包黎红,张久兴,周身林. Ba掺杂对稀土硼化物GdB6结构,晶粒取向和热发射性能的影响（英文）[J]. 无机材料学报, 2011, 0(10): 1116-1120 |
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| 作者姓名： | 包黎红 张久兴 周身林 |
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| 作者单位： | 北京工业大学材料学院新型功能材料教育部重点实验室; |
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| 基金项目： | National Natural Science Foundation of China(50871002) |
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| 摘 要： | 采用反应放电等离子烧结技术,以BaH2,GdH2纳米粉和B粉为原料,成功制备了多晶稀土硼化物(BaxGd1-x)B6(x=0,0.2,0.4,0.8).采用XRD、EBSD技术研究了掺杂元素Ba对GdB6晶体结构及晶粒取向的影响,并测量不同温度下的热发射性能.结果表明,所有烧结样品与传统烧结方法相比,具有高致密度(>97%)和很高的维氏硬度(2070 kg/mm2).GdB6在1873 K时,最大发射电流密度为11 A/cm2,该值远高于传统方法制备的电流密度值.随着Ba含量的增加,发射电流密度从11 A/cm2减小到2.25 A/cm2.
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| 关 键 词： | 稀土硼化物 放电等离子烧结 发射性能 掺杂 |
Effect of Ba-doping on the Structural,Grain Orientation and Thermionic Emission Properties of Hexaboride GdB_6 |
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| BAO Li-Hong,ZHANG Jiu-Xing,ZHOU Shen-Lin P. Effect of Ba-doping on the Structural,Grain Orientation and Thermionic Emission Properties of Hexaboride GdB_6[J]. Journal of Inorganic Materials, 2011, 0(10): 1116-1120 |
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| Authors: | BAO Li-Hong ZHANG Jiu-Xing ZHOU Shen-Lin P |
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| Affiliation: | BAO Li-Hong,ZHANG Jiu-Xing,ZHOU Shen-Lin P(Key Laboratory of Advanced Functional Materials,Ministry of Education,College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China) |
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| Abstract: | The polycrystalline rare-earth hexaborides(BaxGd1-x)B6(x = 0,0.2,0.4,0.8) were prepared by the reactive spark plasma sintering(SPS) method using mixed powder of BaH2,GdH2 and B.The effects of Ba doping content on the crystal structure,the grain orientation and the thermionic emission properties of the GdB6 were investigated by X-ray diffraction,electron backscattered diffraction and emission current measurements.It is found that all the sintered samples exhibit high densification(> 97%) and high value of Vi... |
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| Keywords: | rare-earth hexaborides spark plasma sintering emission property doping |
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