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Surface studies on scandate cathodes and synthesized scandatesAuger, ESCA, electron emission, evaporation, and desorption measurements were made on three different types of scandate surfaces. They are: (1) an impregnated top layer scandate cathode, (2) an unimpregnated top layer scandate cathode with a deposited barium or barium oxide adsorbate surface layer, and (3) a synthesized scandate surface, which replicates a scandate cathode surface. The purpose of these experiments was to determine the role that Sc2O3 plays in making the scandate cathode a more copious electron emitter than the conventional impregnated-type cathode. The synthesized scandate surface experiments consisted of depositing multilayer scandium on a tungsten surface, oxidizing the scandium, and then depositing either Ba or BaO on the scandium oxide surface. The results of these measurements showed that the low work function portions of the thin-film scandate cathode are where the Sc2O3 is the substrate and BaO is the adsorbate.
Document ID
19910040448
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Lesny, Gary
(NASA Lewis Research Center Cleveland, OH, United States)
Forman, Ralph
(Analex Corp. Fairview Park, OH, United States)
Date Acquired
August 14, 2013
Publication Date
December 1, 1990
Publication Information
Publication: IEEE Transactions on Electron Devices
Volume: 37
ISSN: 0018-9383
Subject Category
Electronics And Electrical Engineering
Accession Number
91A25071
Distribution Limits
Public
Copyright
Other

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