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作者:

Yang, Fan (Yang, Fan.) | Wang, Jinshu (Wang, Jinshu.) (学者:王金淑) | Liu, Wei (Liu, Wei.) | Wang, Yiman (Wang, Yiman.)

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摘要:

A new kind of pressed Y2O3 doped Ba-W dispenser cathodes are prepared by a sol-gel method combined with high temperature sintering in dry hydrogen atmosphere. The results show that the growth of the grains is hampered by the pinning effect of Y2O3 distributing uniformly on the surfaces of tungsten particles, resulting in the formation of small grain size. It is found that Y2O3 improves the secondary electron emission property, i.e., the secondary emission yield increases with the increase of Y2O3 content in the samples. The maximum secondary emission yield δmax of the cathode with 15% amount of Y2O3 can reach 2.92. Furthermore, the cathode shows a certain thermionic emission performance. The zero field emission current density J0 of 4.18A/cm has reached at 1050oCb for this kind of cathode after being activated at 1200oCb, which are much higher than that of rare earth oxide doped molybdenum (REO-Mo) cathode reported in the previous work. © 2012 IEEE.

关键词:

Cathodes Dispensers Electrons Electron sources Field emission cathodes Field emission displays Magnetrons Rare earths Secondary emission Sintering Sol-gel process Sol-gels Thermionic emission

作者机构:

  • [ 1 ] [Yang, Fan]School of Materials Science and Engineering, Beijing University of Technology, 100 Pingleyuan, Beijing, 100124, China
  • [ 2 ] [Wang, Jinshu]School of Materials Science and Engineering, Beijing University of Technology, 100 Pingleyuan, Beijing, 100124, China
  • [ 3 ] [Liu, Wei]School of Materials Science and Engineering, Beijing University of Technology, 100 Pingleyuan, Beijing, 100124, China
  • [ 4 ] [Wang, Yiman]School of Materials Science and Engineering, Beijing University of Technology, 100 Pingleyuan, Beijing, 100124, China

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年份: 2012

页码: 181-182

语种: 英文

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