Abstract
The work function of chemically vapor deposited rhenium, with a (0001) preferred orientation, on a molybdenum substrate was determined using the thermionic emission method. Data were collected as a function of time and temperature on temperature ramps from 1800 to 2600 K in 100-K increments. The effect of pressure on effective work function was demonstrated by introducing oxygen, nitrogen, and carbon dioxide through a precision leak valve into the vacuum emission vehicle. The effect of introducing various gasses was negligible. Also, no significant time or temperature dependence was observed. The sample yielded the maximum average effective work function, 5.08 eV, at 2100 K. The overall average effective work function was determined to be 5.02 eV.
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