HIGH EMISSION PERFORMANCE IMPREGNATED DISPENSER CATHODE  

作　　者：Yin Shengyi Peng Zhen Zheng Qiang Wang Yu 

机构地区：[1]Key Laboratory of High Power Microwave Sources and Technologies, Institute of Electronics, Chinese Academy of Sciences [2]University of Chinese Academy of Sciences

出　　处：《Journal of Electronics(China)》2013年第4期417-422,共6页电子科学学刊（英文版）

基　　金：Supported by the National Natural Science Foundation of China (No. 60871053);the Major State Basic Research Development Program of China (No. 2013CB328901)

摘　　要：In order to obtain higher emission performance than that of a traditional M-type cathode, we have developed a new type impregnated dispenser cathode. The new cathode is impregnated with a new active substance with molar ratio of 26BaO·29SrO·8Sc2O3 ·7CaO·Al2O3 . This paper introduces the emission performance, surface active material, and work function of the new cathode. At 1100℃B , the DC current density and pulse current density are 30.6±1.0 A/cm2 and 171.6±2.8 A/cm2 , respectively, 2.1 and 5.4 times of that of an M-type cathode. The work function of the new cathode is 1.668± 0.002 eV. High concentration O-Al-Sc-Sr-Ba and O-Al-Sc-Ba are found in the pores and at pore edges, respectively. By comparing the emission performances and surface characteristics of as-polished and as-cleaned cathodes, it is proposed that, the emission around pore ends forms the major part of the total emission for the new cathodes.In order to obtain higher emission performance than that of a traditional M-type cathode, we have developed a new type impregnated dispenser cathode. The new cathode is impregnated with a new active substance with molar ratio of 26BaO.29SrO.8Sc2O3.7CaO.Al2O3. This paper introduces the emission performance, surface active material, and work function of the new cathode. At 1100 ℃B, the DC current density and pulse current density are 30.6±1.0 A/cm2 and 171.6±2.8 A/cm2, respectively, 2.1 and 5.4 times of that of an M-type cathode. The work function of the new cathode is 1.668±0.002 eV. High concentration O-Al-Sc-Sr-Ba and O-Al-Sc-Ba are found in the pores and at pore edges, respectively. By comparing the emission performances and surface characteristics of as-polished and as- cleaned cathodes, it is proposed that, the emission around pore ends forms the major part of the total emission for the new cathodes.

关 键 词：Dispenser cathode M-type cathode Sc2O3 SRO Emission performance 

分 类 号：TQ153.2[化学工程—电化学工业] TN141.32[电子电信—物理电子学]