赵瑞山,樊玉川,黄美松,杨露辉,刘华,傅臻,文康.中低温用Sm1-2xEuxBaxB6阴极材料的制备及性能研究[J].稀有金属材料与工程,2021,50(3):1020~1025.[Zhao Ruishan,Fan Yuchuan,Huang Meisong,Yang Luhui,Liu Hua,Fu Zhen,Wen Kang.Research on production and properties of Sm1-2xEuxBaxB6 cathode materials for low and medium temperature use[J].Rare Metal Materials and Engineering,2021,50(3):1020~1025.]
中低温用Sm1-2xEuxBaxB6阴极材料的制备及性能研究
投稿时间:2020-05-11  修订日期:2020-06-05
中文关键词:  硼/碳热还原-热压烧结  Sm[sub_s]1-2x[sub_e]Eu[sub_s]x[sub_e]Ba[sub_s]x[sub_e]B[sub_s]6[sub_e]阴极  结构  性能
基金项目:湖南省科技创新计划项目资助(2017TP1031)
中文摘要:
      采用硼/碳热还原-热压烧结集成工艺(BCTR&HP)制备了高纯致密的Sm1-2xEuxBaxB6(x=0.1,0.2,0.3)多晶块体,系统研究Eu&Ba掺杂SmB6对其结构、力学性能与电学特性的影响。结果表明,BCTR&HP制备的Sm1-2xEuxBaxB6呈CsCl型简单立方单相结构,晶格常数随Eu&Ba掺杂量的增加而增大,贡献于力学性能的提高和电阻率的下降。热电子发射性能结果表明,Eu&Ba掺杂能够改善SmB6阴极材料的发射特性,在测试温度1773 K,外加电压1 kV条件下,Sm0.4Eu0.3Ba0.3B6多晶体的发射电流密度达到35.1 mA.cm-2,零场电流密度达到21.4 mA.cm-2,在1523~1773 K其平均有效功函数为3.6 eV,其固有的高电阻率可作为“直热式”阴极简化热子结构,具有很大的应用前景。
Research on production and properties of Sm1-2xEuxBaxB6 cathode materials for low and medium temperature use
英文关键词:boron/carbonthermal reduction-hot pressing sintering  Sm1-2xEuxBaxB6 cathode  structure  property
英文摘要:
      High-purity and density Sm1-2xEuxBaxB6(x=0.1, 0.2, 0.3)polycrystals were prepared by using a boron/carbonthermal reduction-hot pressing sintering (BCTR&HP) integrated process. The effect of Eu&Ba doping the SmB6 matrix on the structure, mechanical and electrical properties of Sm1-2xEuxBaxB6 bulks were investigated systematically. The results show that the Sm1-2xEuxBaxB6 polycrystals produced by BCTR&HP provide a simple cubic (CsCl type) single-phase structure. As the doping amount of Eu&Ba increased, the lattice constant increases, which contributes to the enhancement of mechanical properties and the decrease of resistivity. The thermionic emission performance results show that the Eu&Ba doping can improve the emission characteristics of SmB6 cathode, and the emission current density and zero-field current density of Sm0.4Eu0.3Ba0.3B6 cathode are 35.1 mA.cm-2 and 21.4 mA.cm-2 under the applied voltage of 1 kV at 1773 K, respectively. Meanwhile, the average effective work function is 3.6 eV from 1523 to 1773 K, and it can be used as a "direct heating" cathode benefited by its inherent high resistivity, which simplifies the heater structure and has great application prospects.
作者单位E-mail
赵瑞山 湖南稀土金属材料研究院稀土功能材料湖南省重点实验室 zrs1750@163.com 
樊玉川 湖南稀土金属材料研究院稀土功能材料湖南省重点实验室  
黄美松 湖南稀土金属材料研究院稀土功能材料湖南省重点实验室  
杨露辉 湖南稀土金属材料研究院中南大学  
刘华 湖南稀土金属材料研究院稀土功能材料湖南省重点实验室 Liuhua3561@163.com 
傅臻 湖南稀土金属材料研究院稀土功能材料湖南省重点实验室  
文康 湖南稀土金属材料研究院稀土功能材料湖南省重点实验室  
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