Enhancement of secondary emission property of molybdenum cathode co-doped with La2O3 and Y2O3
来源期刊：Journal of Rare Earths2009年第6期
论文作者：王金淑 刘伟 任志远 杨帆 高非 周美玲
文章页码：975 - 979
摘 要：La2O3 and Y2O3 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.RE2O3 existed uniformly at the grain boundaries and diffused to the cathode surface during a cathode activation period.A surface layer of RE2O3 formed after activation played an important role in the emission.The secondary emission yield of La2O3 and Y2O3 co-doped Mo prepared by liquid-liquid doping method was 4.34.
王金淑，刘伟，任志远，杨帆，高非，周美玲
The Key Lab of Advanced Functional Materials,Ministry of Education China,School of Materials Science and Engineering,Beijing University of Technology
摘 要：La2O3 and Y2O3 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.RE2O3 existed uniformly at the grain boundaries and diffused to the cathode surface during a cathode activation period.A surface layer of RE2O3 formed after activation played an important role in the emission.The secondary emission yield of La2O3 and Y2O3 co-doped Mo prepared by liquid-liquid doping method was 4.34.
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