物理学报Issue(19)：369-374,6.DOI:10.7498/aps.62.196105
放电等离子烧结原位合成Lax Ce1-x B6化合物及性能研究
Synthesis and properties of Lax Ce1-x B6 compounds by in-situ spark plasma sintering
摘要
Abstract
Polycrystalline rare-earth hexaboride (Lax Ce1−x )B6 were prepared by means of the reactive spark plasma sintering (SPS), using mixed powders of GdH2, NdH2 and B. The crystal structure, surface texture, mechanical property, electrical resistivity, and thermionic emission properties of the sintered samples were investigated. It is found that all the samples sintered by SPS exhibit high densily (>96%) and high value of Vickers hardness (2310 kg/mm2), which are much higher than those made by traditional method. Thermionic emission results indicate that the maximum emission current density of La0.6Ce0.4B6 is 40.7 A/cm2 under the applied voltage of 1 kV at 1873 K, which is larger than that of LaB6 and CeB6. Thus, the mixed cystal of borides (LaxCe1−x)B6, as a cathode, promises good prospects in application.关键词
稀土六硼化物/阴极材料/热电子发射Key words
rare-earth hexaboride/cathode materials/thermionic emission引用本文复制引用
包黎红,那仁格日乐,特古斯,张忻,张久兴..放电等离子烧结原位合成Lax Ce1-x B6化合物及性能研究[J].物理学报,2013,(19):369-374,6.基金项目
国家自然科学基金(批准号:51161017)、内蒙古自治区重大基础研究开放课题(批准号:120294)和内蒙古自然科学基金(批准号:2010MS0104)资助的课题 （批准号:51161017）
