Physical Processes in theLCathode
作者:
D. L. Schaefer,
John E. White,
期刊:
Journal of Applied Physics
(AIP Available online 1952)
卷期:
Volume 23,
issue 6
页码: 669-674
ISSN:0021-8979
年代: 1952
DOI:10.1063/1.1702276
出版商: AIP
数据来源: AIP
摘要:
The activity of this barium‐on‐tungsten cathode is maintained by dispensing barium from a pellet of barium compound. The dispensing mechanism is shown to be controlled by surface diffusion of barium over tungsten. Despite incomplete coverage of the emitting surface with barium, and almost complete absence of streaming of active material out through pores in the surface material, evaporation of barium is sufficient to be of concern in certain applications.
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