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,0,():-.[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,0,():-].
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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
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 
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 
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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