无机材料学报Issue(4)：363-368,6.DOI:10.15541/jim20140471
La1-xNdxB6阴极材料的制备及性能研究
Preparation and Property of La1-xNdxB6 Cathode Material
摘要
Abstract
High purity and high density La1-xNdxB6 bulks were prepared by using evaporation condensation combined spark plasma sintering (SPS) with high-purity metal La, Nd bulks and B powder as raw materials. Phase component, the mechanical properties, the resistivity and the thermionic emission properties of La1-xNdxB6 bulks were investigated systematically. The results show that high purity and high density La1-xNdxB6 single-phase bulk material can be prepared by using the above mentioned technology. The sintered samples show high value of Vickers hardness (26.70 GPa) and bending strength (230.48 MPa). According to the thermionic emission results, the bulk of La0.1Nd0.9B6 materials exhib-its optimum thermal emission properties, the emission current density is 32.04 A/cm2 and zero field current density reaches 12.72 A/cm2 at the temperature of 1600℃ and the applied voltage of 4 kV, which is better than LaB6 and NdB6 bulk samples under the same conditions. It is shown that proper Nd content is benefit to reducing the work func-tion and improving the thermionic emission properties, the average of effective work function for La0.1Nd0.9B6 at dif-ferent temperatures is 2.72 eV.关键词
稀土六硼化物/蒸发-冷凝/放电等离子烧结/热电子发射性能Key words
rare-earth hexaborides/evaporation-condensation/spark plasma sintering/thermionic emission property分类
化学化工引用本文复制引用
梁超龙,张忻,张久兴,张繁星,王杨..La1-xNdxB6阴极材料的制备及性能研究[J].无机材料学报,2015,(4):363-368,6.基金项目
国家自然科学基金(50871002) （50871002）
北京市自然科学基金(2112007) National Natural Science Foundation of China (50871002) （2112007）
Beijing Natural Science Foundation (2112007) （2112007）
