Effects of Scandia distribution on surface structure of scandate cathodes

Xiaomeng Zhang, T. John Balk, Daniel Busbaher, Andrew Hunt

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

Scandate cathodes have long attracted attention due to their higher emission current density, apparent low work function, and anticipated improved longevity comparing to conventional cathodes. However, scandate cathodes have not been applied as extensively as their potential would imply, due to many unresolved issues, one of them being the non-uniformity of emission from the cathode surface. One possible reason for this, namely uneven distribution of scandia on tungsten, is investigated here. By comparing the initial microstructure of tungsten- scandia powder to resulting sintered pellets, we have discovered that more complete scandia coverage corresponds to a larger number of scandia particles distributed on sintered tungsten. Nearly all samples, when prepared as sintered pellets, exhibited a work function of 5.1 eV, as measured with a Kelvin probe.

Original languageEnglish
Title of host publication2018 IEEE International Vacuum Electronics Conference, IVEC 2018
Pages231-232
Number of pages2
ISBN (Electronic)9781538604540
DOIs
StatePublished - Jun 20 2018
Event19th IEEE International Vacuum Electronics Conference, IVEC 2018 - Monterey, United States
Duration: Apr 23 2018Apr 26 2018

Publication series

Name2018 IEEE International Vacuum Electronics Conference, IVEC 2018

Conference

Conference19th IEEE International Vacuum Electronics Conference, IVEC 2018
Country/TerritoryUnited States
CityMonterey
Period4/23/184/26/18

Bibliographical note

Publisher Copyright:
© 2018 IEEE.

Keywords

  • coverage
  • microstructure
  • scandate cathode
  • scandia powder
  • sintered pellet
  • tungsten
  • work function

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Instrumentation

Fingerprint

Dive into the research topics of 'Effects of Scandia distribution on surface structure of scandate cathodes'. Together they form a unique fingerprint.

Cite this