Fabrication and Characterization of High-purity Nanostructured Bulk LaB6 Polycrystal Cathode Material

doi:10.3724/SP.J.1077.2008.01199

Journal of Inorganic Materials

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Fabrication and Characterization of High-purity Nanostructured Bulk LaB₆ Polycrystal Cathode Material

ZHOU Shen-Lin, LIU Dan-Min, ZHANG Jiu-Xing

The Key Laboratory of Advanced Functional Materials, Ministry of Education, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China

Received:2007-12-28 Revised:2008-03-11 Published:2008-11-20 Online:2008-11-20

Abstract

Abstract: La-LaH₂ nanopowders were prepared by hydrogen arc plasma method, and then the mixed nanopowders of La-LaH₂ and B were in situ sintered by Sparkle Plasma Sintering (SPS) method in oxygen free system. High-purity LaB₆ polycrystal nanostructured bulk was successfully synthesized by SPS. The dehydrogenation of LaH₂ nanopowders and the reaction equation of sintering LaB₆ were studied. The phase and microstructure of LaB₆ bulks were characterized by using XRD, SEM, TEM and AFM techniques. The results show that the dehydrogenation temperature of LaH₂ nanopowders is 796.4℃. The sintered body is single-phase LaB₆, which has a high purity of 99.867%, and its relative densities is up to 99.2%. The hardness and bend strength of the sintered LaB₆ are much better than those of LaB₆ prepared by other sintering methods. The crystals of LaB₆ bulk are equiaxed crystals, the average grain size of the bulks sintered at 50MPa and 1250-1350℃ is about 120nm. The grains are homogeneous and integrated, and the grain size increases with the raising of sintering temperature.

Key words: spark plasma sintering (SPS), polycrystal Lanthanum hexaboride, nanostructured bulk, hot cathode

CLC Number:

ZHOU Shen-Lin,LIU Dan-Min,ZHANG Jiu-Xing. Fabrication and Characterization of High-purity Nanostructured Bulk LaB₆ Polycrystal Cathode Material[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2008.01199.

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Fabrication and Characterization of High-purity Nanostructured Bulk LaB₆ Polycrystal Cathode Material

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