Surface composition of Si‐TaSi2eutectic cathodes and its effect on vacuum field emission

Autor:	James J. Hickman, Douglas A. Kirkpatrick, Mark Czarnaski, George L. Bergeron
Rok vydání:	1992
Předmět:	Materials science Physics and Astronomy (miscellaneous) Oxide Mineralogy Isotropic etching Cathode law.invention Field electron emission Surface coating chemistry.chemical_compound Chemical engineering chemistry law Torr Layer (electronics) Eutectic system
Zdroj:	Applied Physics Letters. 61:2518-2520
ISSN:	1077-3118 0003-6951
DOI:	10.1063/1.108166
Popis:	Our research shows that the presence of an oxide layer on the surface of a field emission cathode is deleterious to its performance and that, for successful operation, removal of this layer is necessary before overcoating with another material. We further show that once the surface oxide is removed, cathodes can be protected with a Au overcoat and run in harsh environments. We have demonstrated stable emission for a Au‐coated Si‐TaSi2 cathode for over 100 h in an O2 atmosphere at 5×10−6 Torr.
Databáze:	OpenAIRE
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