Zhou, SL (reprint author), Jinggangshan Univ, Coll Math & Phys, Jian 343409, Jiangxi, Peoples R China.
[Zhou, Shen Lin
; Yu, Xiao Guang
; Hu, Qiang Lin
; Hu, Dong Qiang] Jinggangshan Univ, Coll Math & Phys, Jian 343409, Jiangxi, Peoples R China
; [Zhou, Shen Lin] Tongji Univ, Shanghai Key Lab Special Artificial Microstruct, Shanghai 200092, Peoples R China
; [Zhou, Shen Lin] Tongji Univ, Pohl Inst Solid State Phys, Shanghai 200092, Peoples R China
; [Zhou, Shen Lin] Tongji Univ, Sch Phys Sci & Engn, Shanghai 200092, Peoples R China
; [Zhou, Shen Lin] Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China
; [Zhang, Jiu Xing] Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Peoples R China
; [Bao, Li Hong] Inner Mongolia Normal Univ, Inner Mongolia Key Lab Phys & Chem Funct Mat, Hohhot 010022, Peoples R China
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.
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.