Abstract
Thermally induced changes in work function and surface composition of a sputter-formed Re-1%Mo alloy have been measured. Segregation of Mo to the alloy surface was accompanied by a decrease in surface work function. The relationship between surface composition and work function change fits the Topping model of dipole layer formation with dipoles being formed by electron transfer from Mo to Re. Values for the dipole moment at zero field and the polarizability of Mo on the surface of Re were found to be (5.27±0.36)×10−30 C m and (74.1±10.1) Å3, respectively. The direction of charge transfer is consistent with published electronegativity values for Mo and Re, but its magnitude of 0.126 electrons per atom was significantly smaller than the charge transfer in the bulk expected upon alloy formation.
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