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Related Experiment Videos

Recent progress on RE2O3-Mo/W emission materials.

Jinshu Wang1, Xizhu Zhang, Wei Liu

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

Journal of Nanoscience and Nanotechnology
|September 12, 2012
PubMed
Summary
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Spark plasma sintering (SPS) enhances secondary electron emission in La2O3-Y2O3-Mo cathodes by reducing grain size. Smaller grains improve electron escape, while Scandia-doped tungsten cathodes achieve high current densities due to a unique surface layer.

Area of Science:

  • Materials Science
  • Surface Science
  • Vacuum Electronics

Background:

  • Rare-earth oxide (RE2O3) doped molybdenum/tungsten (Mo/W) cermet cathodes are crucial for electron emission applications.
  • Optimizing secondary electron emission properties is essential for improving cathode performance.
  • Understanding the relationship between microstructure and emission characteristics is key to developing advanced cathodes.

Purpose of the Study:

  • To investigate the effect of spark plasma sintering (SPS) on the secondary emission properties of La2O3-Y2O3-Mo cermet cathodes.
  • To explore the correlation between cathode grain size and secondary electron emission mechanisms using Monte Carlo simulations.
  • To evaluate the thermionic emission properties of Scandia-doped tungsten matrix dispenser cathodes with sub-micrometer microstructures.

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Main Methods:

  • Powder metallurgy for RE2O3-Mo/W cathode preparation.
  • Traditional sintering and spark plasma sintering (SPS) for cermet cathode fabrication.
  • Monte Carlo simulations to model secondary electron emission.
  • Characterization of microstructure and surface properties.

Main Results:

  • SPS-processed La2O3-Y2O3-Mo cathodes exhibited smaller grain sizes and superior secondary emission performance compared to traditionally sintered ones.
  • Monte Carlo simulations revealed that reduced grain size decreases the positive charging effect of RE2O3, facilitating secondary electron escape.
  • Scandia-doped tungsten cathodes achieved over 100 A/cm2 current density at 950°C, attributed to a Ba-Sc-O surface layer with nanoparticle distribution on W grain steps.

Conclusions:

  • SPS is an effective method for enhancing the secondary electron emission of La2O3-Y2O3-Mo cathodes by controlling grain size.
  • Grain size significantly influences secondary electron emission dynamics, with smaller grains being more favorable.
  • The developed Scandia-doped tungsten dispenser cathode demonstrates excellent thermionic emission properties for high-current applications.