Standard Historical Last Updated: Dec 31, 2010 Track Document
ASTM F83-71(2002)

Standard Practice for Definition and Determination of Thermionic Constants of Electron Emitters

Standard Practice for Definition and Determination of Thermionic Constants of Electron Emitters F0083-71R02 ASTM|F0083-71R02|en-US Standard Practice for Definition and Determination of Thermionic Constants of Electron Emitters Standard new BOS Vol. 10.04 Committee F01
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Abstract

This practice covers the definition and interpretation of the commonly used thermionic constants of electron emitters with appended standard methods of measurement. Cathode materials shall alternatively be evaluated by relating the temperature-limited emission to fundamental properties of the emitter, particularly the work function. Comparisons are made between emitters using the thermionic constants such as the work function, emission constant, and the temperature dependence of the work function. These thermionic constants are geometry and field effects-independent, but exhibit variations under different conditions. The pertinent equations the Richardson-Dushman equation of electron emission to evaluate the effective work function, which in turn, shall be used to find the Richardson work function and the true work function. Sample computations are also detailed.

Scope

1.1 This practice covers the definition and interpretation of the commonly used thermionic constants of electron emitters (1, 2, 3), with appended standard methods of measurement.

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Details
Book of Standards Volume: 10.04
Developed by Subcommittee: F01.03
Pages: 5
DOI: 10.1520/F0083-71R02
ICS Code: 01.040.31; 31.100