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High current density Sc2O3-W matrix dispenser cathode

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Abstract

Sc2O3-W matrix dispenser cathodes have been prepared by powder metallurgy method and tested in Pierce electron guns. The emission current density can reach 72 A/cm2 at 900°C and over 100 A/cm2 can be achieved at a temperature higher than 950°C. The emission improves and then keeps stable with time throughout the life testing period of 330 h at a continuous loading of 88 A/cm2 pulsed current density with a pulse width of 10 μs and duty cycle of 0.2%. The cathode surface is covered by a semiconductor multilayer composed of Ba, Sc and O. The emission behavior of the cathode can be explained by a semiconductor model.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, China

    JinShu Wang, XiZhu Zhang, Wei Liu, YiMan Wang, MeiLing Zhou & TieYong Zuo

Authors
  1. JinShu Wang
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  2. XiZhu Zhang
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  3. Wei Liu
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  4. YiMan Wang
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  5. MeiLing Zhou
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  6. TieYong Zuo
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Corresponding author

Correspondence to JinShu Wang.

Additional information

WANG JinShu was born in 1968. She received the Ph.D. degree in materials science from Beijing University of Technology, Beijing, in 1999. From 2002 to 2004, she was a postdoctoral fellow in Tohoku University, Japan. Currently, she is a professor at Beijing University of Technology. Her research interests include cathodes, nanomaterials and photocatalyst. She is the committee member of Vacuum Electron Society, Chinese Electronics Society; the members of IEEE, American Chemistry Society, Japanese Chemistry Society and Japanese Ceramic Society.

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Wang, J., Zhang, X., Liu, W. et al. High current density Sc2O3-W matrix dispenser cathode. Sci. China Inf. Sci. 55, 98–105 (2012). https://doi.org/10.1007/s11432-011-4518-y

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  • DOI: https://doi.org/10.1007/s11432-011-4518-y

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