Abstract
The temperature coefficient of the work function (TCWF) of polycrystalline Mo and Ni is measured in the temperature ranges 600 to 1100 deg K and 475 to 1025 deg K, respectively, using the electron beam method. Special precautions are taken to avoid systematic errors due to the effects of residual gases, stray magnetic fields, incorrect temperature measurements, cathode temperature variations, etc. During determinations made upon Ni surfaces, the terrestrial magnetic field is compensated. Random error sources are likewise reduced as much as possible. The main results obtained on surfaces outgassed for many thousands of hours at pressures of 1 to 3 x 10/sup -//sup 9/ torr are TCWF = (7.84 plus or minus 0.07) x 10/sup -//sup 5/ ev/ deg K for Mo, and TCWF = (-- 3.12 plus or minus 0.05) x 10/sup -//sup 5/ ev/ deg K for Ni above the Curie point, theta . At the Curie point of Ni a theoretically expected variation of the TCWF is observed: TCWF(T theta ) = (--0.99 plus or minus 0.17) x 10/sup -//sup 5/ ev/ deg K, but no jump of the work function (WF) is found at this point. Experiments show that the results aremore » not significantly affected by residual gases. A relation between the TCWF measured on polycrystalline surfaces of Ni and the TCWF of the various facets of these surfaces is obtained. (auth)« less
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