A new impregnated dispenser cathode

Shengyin Yin, Zhaochuan Zhang, Zhen Peng, Qiang Zheng, Yu Wang

Research output: Contribution to journalArticlepeer-review

Abstract

To meet the demand of terahertz devices, we develop a new type impregnated dispenser cathode. This cathode is impregnated with an active substance with molar ratio of 26{\rm BaO}{\cdot}29{\rm SrO}{\cdot}8{\rm Sc}-{2}{\rm O}-{3}{\cdot}7{\rm CaO}{\cdot}{\rm Al}-{2}{\rm O}3. We test its emission performance, practical work function distribution, and surface composition, and analyze the mechanism of the high emission performance. At 1100 ^{\circ}{\rm C}\rm B, the pulse current density is 171.6\pm 2.8~{\rm A}/{\rm cm}2, 5.4 times of that of an M-type cathode. The peak work function of Miram curve is {\sim}{\rm 1.570}~{\rm eV}. Ba, Sc, Ca, Al, and O atoms are detected on most surfaces of tungsten grains. It is proposed that the Ba-Sc-Al-Ca-O layer on the surface of the cathode is responsible for the excellent emission performance.

Original languageEnglish (US)
Article number6657795
Pages (from-to)4258-4262
Number of pages5
JournalIEEE Transactions on Electron Devices
Volume60
Issue number12
DOIs
StatePublished - Dec 2013
Externally publishedYes

Keywords

  • Ba
  • Sr
  • emission performance
  • impregnated scandate cathode

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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