Enhancement of secondary emission property of molybdenum cathode co-doped La_2O_3 and Y_2O_3
来源期刊：JOURNAL OF RARE EARTHS2009年第6期
论文作者：GAO Fei WANG Jinshu REN Zhiyuan LIU Wei YANG Fan ZHOU Meiling
Key words：molybdenum; secondary emission; cathode; rare earths;
Abstract: La_2O_3 and Y_2O_3 co-doped Mo secondary emitters were prepared by three kinds of doping method combined with high temperature plasma sintering. The secondary electron emission property and microstructure of the cathodes were studied. It showed that the cathode prepared by liquid-liquid doping method exhibited the best emission property among all the samples prepared by liquid-solid doping,solid-solid doping and liquid-liquid doping methods due to a uniform distribution of different substances. RE_2O_3 existed uniformly at the grain boundaries and diffused to the cathode surface during a cathode activation period. A surface layer of RE_2O_3 formed after activation played an important role in the emission. The secondary emission yield of La_2O_3 and Y_2O_3 co-doped Mo prepared by liquid-liquid doping method was 4.34.
GAO Fei1，WANG Jinshu1，REN Zhiyuan1，LIU Wei1，YANG Fan1，ZHOU Meiling1
(1.The Key Lab of Advanced Functional Materials,Ministry of Education China,School of Materials Science and Engineering,Beijing University of Technology,Beijing 100022,China)
Abstract:La_2O_3 and Y_2O_3 co-doped Mo secondary emitters were prepared by three kinds of doping method combined with high temperature plasma sintering. The secondary electron emission property and microstructure of the cathodes were studied. It showed that the cathode prepared by liquid-liquid doping method exhibited the best emission property among all the samples prepared by liquid-solid doping,solid-solid doping and liquid-liquid doping methods due to a uniform distribution of different substances. RE_2O_3 existed uniformly at the grain boundaries and diffused to the cathode surface during a cathode activation period. A surface layer of RE_2O_3 formed after activation played an important role in the emission. The secondary emission yield of La_2O_3 and Y_2O_3 co-doped Mo prepared by liquid-liquid doping method was 4.34.
Key words:molybdenum; secondary emission; cathode; rare earths;
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