物理学报2012，Vol.61Issue(22)：470-475,6.
Pr1-xCexB6阴极材料的原位反应合成及性能研究
Synthesis and properties of multiple boride Pr1-xCexB6 cathodes by reactive spark plasma sintering
摘要
Abstract
The polycrystalline Pr1-xCexB6(x = 0.2, 0.4, 0.6, 0.8) hexaborides are prepared by the reactive spark plasma sintering (SPS) method using mixed powder of Cell2, PrH2 and B. The effects of Ce doping on the phase composition, the mechanical properties and the thermionic emission properties of the hexaboride are investigated. The single-phased hexaborides Pr1-xCexB6 bulks are sintered at a temperature of 1450℃, pressure of 50MPa and holding time of 5 min, and the sintered samples show high value of Vickers hardness (24.34 GPa) and bend strength (226.02 MPa). The thermionic emission results show that with the increase of Ce content, the thermionic emission current density increases linearly and the maximum value of Pr0.4Ce0.6B6 reaches 47.3 A.cm-2 under an applied voltage of 950 V at 1973 K, which is much higher than that obtained by traditional method. Thus, the SPS technique represents a suitable method to synthesize the dense rare-earth hexaborides with excellent properties.关键词
稀土六硼化物/放电等离子烧结/热电子发射性能Key words
rare-earth hexaborides/spark plasma sintering/thermionic emission property分类
化学化工引用本文复制引用
李晓娜,张忻,张久兴,包黎红,张宁,张繁星..Pr1-xCexB6阴极材料的原位反应合成及性能研究[J].物理学报,2012,61(22):470-475,6.基金项目
国家自然科学基金（批准号：50871002）,北京市自然科学基金（批准号：2112007）和北京市属高校人才强教青年骨干人才培养项目（批准号：PHR20110812）资助的课题. （）
