Abstract
Binary alloy samples of W and Mo have been prepared by arc co‐melting of the pure metals. Polished disks of the alloys were shown to be homogeneous by analysis using the electron microprobe and Auger electron spectroscopy. The surface composition of the samples was determined using the W(351) and Mo(120) Auger peaks because the other low energy peaks, though stronger, are overlapping. Sputtering with 500 V argon ions produces a surface which is enriched in W, whereas alloys thermally equilibrated at ∠2000 K are enriched in Mo. Both observations are consistent with the weaker binding energy of Mo in the alloys as revealed by its lower melting point. The preferential sputtering observed for Mo is in good agreement with that calculated from the measured sputtering coefficients for the pure metals. The effect of different escape depths and back‐scattering coefficients in the production of the Auger electrons is discussed.
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