ISSN:
1572-9567
Keywords:
Electron affinity
;
high temperature
;
magnetohydrodynamics
;
thermal emission of electrons
;
work function
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract There have been significant advances in MHD (magnetohydrodynamics) conversion recently. Hower, the lifetime of electrodes remains too short due to degradation derived from several mechanisms. Electrical degradation is a consequence of an ionic conductivity contribution and of inefficient thermal emission of electrons. The last factor is analyzed for oxides. Point defects are important to understand the effect of the gaseous environment and influence mainly the preexponential term in electron emission expressions. A correlation between the electron affinity χ and the band gap E g may help to determine a rough value of χ. Oxides with low electron affinity and appropriate doping appear attractive for further research.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00503941
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