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The interaction between 119Sn and solute atoms dissolved in iron; the case of beryllium alloy

Be is a small atom (V=4.89 cm3 mol-1) compared with Fe and Sn (V=7.09 and 16.30 cm3 mol-1 respectively). As a result, size mismatch theories predict an attractive component of the potential between Be and Sn when dissolved in iron. The author presents spectra of 119Sn in a FeBe alloy, from which he deduces repulsive interactions at first- and second-neighbour distances. The first-neighbour interaction is in fair agreement with the semi-empirical theory of Miedema and Krolas. The repulsive interaction at the second-neighbour distance contradicts the expectation developed in earlier papers. He also makes some comments on the influence of solute-solute interactions on the deduction of probe-solute interaction potentials.