Abstract
The electron work function variation of tungsten samples has been experimentally studied in a strontium vapor environment: single crystal sample in a thermoelectronic emission microscope, polycrystalline sample in a strontium filled cylindrical diode. The data show the emission current density versus the reciprocal sample temperature T-1, and work function variation versus the ratio T/TSr, TSr being the strontium reservoir temperature. Comparison of these results obtained by two methods in different strontium pressure ranges and the study of oxygen influence are of interest for thermionic conversion.