NDLI: The base metal of the oxide-coated cathode

Content Provider	IEEE Xplore Digital Library
Author	Poret, F. Roquais, J.M.
Copyright Year	2004
Description	Author affiliation: Lab. d'Optique Electronique, Genlis, France (Poret, F.; Roquais, J.M.)
Abstract	Since the discovery of its excellent thermionic emission performances, 100 years ago by A. Wehnelt, the oxide-coated cathode has been the most widely used electron emitter in vacuum electronic devices: in vacuum valves up to the late 60's, and afterwards in CPT's and CDT's. Schematically, this cathode is composed of a 60 to 150 thick nickel alloy substrate called the base metal, covered with a 50 to 100 thick porous layer of alkaline-earth oxide. The exact definition of its "emitting system", i.e. base metal and emissive oxide, varies from one company to another. It is noteworthy that the emissive oxide is either a mixture of BaO, SrO or BaO, SrO and CaO, respectively called double or triple oxide having always sensitively the same respective composition. The base metal composition is of primary importance for the cathode emitting properties and is very often proprietary of the cathode manufacturing companies. Actually, the definition of base metal is more an "art" than a science because of the large number of parameters to take into account and of their potential interactions.
Starting Page	94
Ending Page	96
File Size	159606
Page Count	3
File Format	PDF
ISBN	0780384377
DOI	10.1109/IVESC.2004.1414147
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-09-06
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Barium Nickel alloys Thermionic emission Electron guns Semiconductor process modeling Coatings Chemical elements Weibull distribution Acceleration Cathodes
Content Type	Text
Resource Type	Article

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