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Anisotropy of thermionic electron emission values for LaB6 single-crystal emitter cathodes

  • Author(s): Schmidt, PH
  • Joy, DC
  • Longinotti, LD
  • Leamy, HJ
  • Ferris, SD
  • Fisk, Z
  • et al.

Published Web Location

https://doi.org/10.1063/1.89119Creative Commons 'BY' version 4.0 license
Abstract

Measurement of thermionic electron emission values for pointed LaB 6 single-crystal emitter cathodes has shown that 〈110〉 axial orientations yield emission values ten times higher than 〈100〉 orientations at 1545°K. Minimum values were obtained for the 〈510〉 directions. These findings seem encouraging in achieving perhaps two orders of magnitude higher emission fluxes as compared to tungsten emitters.

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