Enhanced thermionic emission properties in textured two-phase LaB6-BaB6 system prepared by spark plasma sintering

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	Enhanced thermionic emission properties in textured two-phase LaB6-BaB6 system prepared by spark plasma sintering
	Zhou, SL ; Zhang, JX ; Bao, LH ; Yu, XG ; Hu, QL ; Hu, DQ
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2014
卷号	611 页码:130-134
关键词	LANTHANUM HEXABORIDE WORK FUNCTION LAB6 OXIDATION VACANCIES
ISSN号	0925-8388
通讯作者	Zhou, SL (reprint author), Jinggangshan Univ, Coll Math & Phys, Jian 343409, Jiangxi, Peoples R China.
英文摘要	Structure, crystallographic orientation, and thermionic emission properties of the two-phase LaB6-BaB6 system fabricated by a combined process of evaporation-condensation and spark plasma sintering (SPS) were investigated systematically. The powder X-ray diffraction (XRD) reveals that the obtained nominal composition (La0.6Ba0.4) B-6 compound exhibits coexistence of two isostructural phases of LaB6 and BaB6. The electron backscatter diffraction (EBSD) confirms that the surface of the (La0.6Ba0.4)B-6 forms a clear (001) texture, which favors reduction in work function. Thermionic emission properties were measured in the temperature range between 1500 and 1873 K. The results indicated that the (La0.6Ba0.4)B-6 emitter displayed a low work function of 1.95 eV, and a high zero field emission current density of 10 A cm (2) at 1773 K. Compared to the reported LaB6 and (La0.6Sm0.4)B-6 prepared for identical synthesis conditions, (La0.6Ba0.4)B-6 is shown to have the most excellent thermionic emission performance and could be promising candidate for cathode material applications. It was revealed that the addition of BaB6 to LaB6 plays an important role for the reduction of work function and enhancement of electron emission properties. (C) 2014 Elsevier B. V. All rights reserved.
学科主题	Physics
收录类别	SCI
资助信息	National Natural Science Foundation of China [11064005]; State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, China [Y4KF181CJ1]; Science and Technology Planning Project of Jiangxi Province Department of Education [GJJ14552]; Provincial Key Disciplines of Atomic and Molecular Physics, Jiangxi Province
原文出处	http://dx.doi.org/10.1016/j.jallcom.2014.05.067
语种	英语
WOS记录号	WOS:000338932400022
公开日期	2015-06-03
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/15607]
专题	理论物理研究所_理论物理所1978-2010年知识产出
推荐引用方式 GB/T 7714	Zhou, SL,Zhang, JX,Bao, LH,et al. Enhanced thermionic emission properties in textured two-phase LaB6-BaB6 system prepared by spark plasma sintering[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2014,611:130-134.
APA	Zhou, SL,Zhang, JX,Bao, LH,Yu, XG,Hu, QL,&Hu, DQ.(2014).Enhanced thermionic emission properties in textured two-phase LaB6-BaB6 system prepared by spark plasma sintering.JOURNAL OF ALLOYS AND COMPOUNDS,611,130-134.
MLA	Zhou, SL,et al."Enhanced thermionic emission properties in textured two-phase LaB6-BaB6 system prepared by spark plasma sintering".JOURNAL OF ALLOYS AND COMPOUNDS 611(2014):130-134.