HIGH EMISSION PERFORMANCE IMPREGNATED DISPENSER CATHODE

作     者：Yin Shengyi Peng Zhen Zheng Qiang Wang Yu 

作者机构：Key Laboratory of High Power Microwave Sources and Technologies Institute of Electronics Chinese Academy of Sciences University of Chinese Academy of Sciences 

出 版 物：《Journal of Electronics(China)》 (电子科学学刊（英文版）)

年 卷 期：2013年第30卷第4期

页      面：417-422页

学科分类：081702[工学-化学工艺] 080901[工学-物理电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0817[工学-化学工程与技术] 

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

主　　题：Dispenser cathode M-type cathode Sc2O3 SrO Emission performance 

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.