Title :
The nature of the emitting surface of scandate cathodes
Author :
Brodie, Ivor ; Vancil, Bernard
Author_Institution :
Univ. of California, Davis, Davis, CA, USA
Abstract :
Experimental evidence to support the concept that the low temperature electron emission from scandate cathodes arises from a dispersed layer of scandium oxide nano-crystals on a tungsten substrate that are activated by a monolayer of adsorbed barium atoms. Particularly convincing are images of the cathode surface from an electron emission microscope.
Keywords :
cathodes; electron emission; monolayers; scandium compounds; scanning electron microscopy; ScO; W; adsorbed barium atom monolayer; cathode surface; dispersed layer; electron emission microscope; emitting surface; low temperature electron emission; scandate cathodes; scandium oxide nanocrystals; tungsten substrate; Barium; Cathodes; Crystals; Electron emission; Scanning electron microscopy; Tungsten; emission microscope; nano-crystals; scandate cathodes; surface donors; thermionic emission;
Conference_Titel :
Vacuum Electronics Conference, IEEE International
Conference_Location :
Monterey, CA
DOI :
10.1109/IVEC.2014.6857486
