Transition metal alloy heats of formation from photoemission data

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Abstract
A method is described which allows an estimate of transition metal alloy heats of formation, Delta H, from valence-band and core-electron binding-energy photoemission data. The scheme is based on the following assumptions: (i) Delta H is determined by the d-band properties of the alloy; (ii) the core electrons do not contribute to Delta H; (iii) the d-band centroid position shifts on alloying may be determined from UPS valence-band spectra; and (iv) the charge transfer on alloying may be neglected, i.e. the number of d electrons of the two constituents do not change on alloying. This method is applied to a number of transition metal alloys with split d bands for which accurate photoemission data are available. The alloy heats of formation, deduced from photoemission data, are in good agreement which calculated and directly measured values of Delta H.