By Topic

Thermionic Emission from Oxide‐Coated Tungsten Filaments

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $31
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

1 Author(s)
Hadley, C.P. ; Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts

Your organization might have access to this article on the publisher's site. To check, click on this link: 

A study has been made of thermionic emission from tungsten filaments cataphoretically coated with alkaline earth oxides. It was found that the emission from the oxide‐coated filament was not influenced by the variation of work‐function with crystallographic direction of the base metal. A Richardson plot of emission at zero field yielded an apparent work function of 1.3 volts and an A value of 0.048 amp/cm2‐deg2. In retarding potential data, the energy of thermionic electrons showed an apparent deviation from Maxwell‐Boltzmann statistics. This deviation was interpreted as due to a potential drop through the coating. Such an interpretation led to a conductivity activation‐energy of 1.3 volts. A strip theory of patches was used to explain the accelerating potential data. Satisfactory agreement with experiment was found with a patch amplitude of 0.2 volt and a period of 2×10-6 meter.

Published in:

Journal of Applied Physics  (Volume:24 ,  Issue: 1 )