Synthesis and properties of CeB6 thermionic cathode with {001} fiber texture by reactive spark plasma sintering method - 文章详情页

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EI Scopus

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Rare　earth　hexaborid　have　attracted　much　attention　because　of　their　excellent　properties　such　as　low　work　function,　high　melting　temperature,　strength,　and　chemical　stability　[1].　Hexaboride　des　are　of　great　technological　significance　as　thermionic　cathodes　in　electronic　devices　[2-3].　CeB6　is　one　of　the　rare　earth　borides　owning　high　emission　density　with　low　work　function　and　low　operating　temperature.　CeB6　is　resistant　to　the　negative　impact　of　carbon　contamination　than　LaB6.　Moreover,　CeB　6　has　higher　resistivity　than　LaB6,　this　means　it　is　more　suitable　as　direct　cathode　than　LaB6.　Hence,　CeB6　is　the　material　of　choice　for　high　current　density　cathode.　However,　in　fact,　because　of　the　long　sintering　time　and　high　temperature,　the　traditional　hot　pressure　sintering　preparation　of　polycrystalline　CeB6　bulk　causes　coarse　grains　and　low　density　which　decrease　the　emission　property.　In　this　paper,　we　report　a　study　on　quick　spark　plasma　sintering　(SPS)　method　for　synthesizing　the　polycrystalline　CeB6　bulk.　©　2010　IEEE.

关键词：

Work function Lanthanum compounds Spark plasma sintering Cerium compounds Textures Rare earths Borides Thermionic cathodes Chemical stability

作者机构：

[ 1 ] [Zhou, S.L.]Key Laboratory of Advanced Functional Materials, Ministry of Education, College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, China
[ 2 ] [Zhang, J.X.]Key Laboratory of Advanced Functional Materials, Ministry of Education, College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, China
[ 3 ] [Liu, D.M.]Institute of Micro structure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124, China
[ 4 ] [Bao, L.H.]Key Laboratory of Advanced Functional Materials, Ministry of Education, College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, China
[ 5 ] [Wei, Y.F.]Key Laboratory of Advanced Functional Materials, Ministry of Education, College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, China
[ 6 ] [Ma, R.G.]Institute of Micro structure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124, China
[ 7 ] [Huang, Q.Z.]NIST Center for Neutron Research, National Institute of Standards and Technology, Maryland 20899, United States

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