Title :
Microstructure and mechanism of emission of W-Ba dispenser cathodes
Author :
Getman, O.I. ; Lushkin, A.E. ; Panichkina, V.V. ; Rakitin, S.P.
Author_Institution :
Inst. for Problems of Material Sci. NASU, Kiev, UK
Abstract :
The influence of tungsten powder dispersity and tungsten skeleton microstructure on the formation of emission power of dispenser cathodes (DC) under heat vacuum treatment, namely under degassing and activating was investigated. Emissive and Auger spectrometry investigations were carried and the DC microstructure characteristics were obtained. It is presumed that DC emission power is connected with the presence of three-dimensional BaO-CaO formations, monatomic (BaO and Ba) films and excess oxygen on the tungsten phase surface.
Keywords :
Auger electron spectroscopy; barium compounds; emissivity; powders; thermionic cathodes; thermionic electron emission; tungsten; Auger spectrometry; BaO-CaO; W-Ba; dispenser cathodes; emission power; emissive spectrometry; heat vacuum treatment; phase surface; tungsten powder dispersity; tungsten skeleton microstructure; Cathodes; Heat treatment; Mercury (metals); Microstructure; Powders; Skeleton; Spectroscopy; Temperature dependence; Thermionic emission; Tungsten;
Conference_Titel :
Vacuum Electron Sources Conference, 2004. Proceedings. IVESC 2004. The 5th International
Print_ISBN :
0-7803-8437-7
DOI :
10.1109/IVESC.2004.1414190
