Microstructure and mechanism of emission of W-Ba dispenser cathodes

Microstructure and mechanism of emission of W-Ba dispenser cathodes

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 m...

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Bibliographische Detailangaben
Hauptverfasser: Getman, O.I., Lushkin, A.E., Panichkina, V.V., Rakitin, S.R.
Format: Tagungsbericht
Sprache:eng
Schlagworte:
Cathodes
Heat treatment
Mercury (metals)
Microstructure
Powders
Skeleton
Spectroscopy
Temperature dependence
Thermionic emission
Tungsten
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Beschreibung
Zusammenfassung: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.
DOI:10.1109/IVESC.2004.1414190