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Instruments and Experimental Techniques

, Volume 62, Issue 4, pp 573–577 | Cite as

The Emission and Electrophysical Features of an Yttria-Coated Iridium Cathode

  • E. V. Rut’kov
  • N. R. GallEmail author
LABORATORY TECHNIQUES
  • 13 Downloads

Abstract

A laboratory technology for manufacturing iridium–yttrium cathodes, which are totally or locally coated with yttria, was developed. A technique for determining the emissivity on the iridium surface was proposed and its value was determined: 0.6 at a wavelength of 665 nm. The work function of such film cathodes was determined: eφ = 3.4 eV. The temperature range of the cathode operation under the conditions of a medium vacuum was established, and it was shown that this operation is efficient only for Т ≥ 1600 K. A physical model for describing this process is proposed. The high thermal stability of yttria-based cathodes, which can withstand heating at Т = 2500 K for hours without degradation, is shown.

Notes

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Copyright information

© Pleiades Publishing, Ltd. 2019

Authors and Affiliations

  1. 1.Ioffe Physical-Technical Institute, Russian Academy of SciencesSt. PetersburgRussia

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