A study of the solution of tin in iron-nickel and iron-palladium alloys by Mossbauer spectroscopy

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Abstract
A study of the solution of 119Sn in nickel-iron and palladium-iron alloys by Mossbauer spectroscopy is presented. An attractive interaction is found between Sn atoms and nickel or palladium atoms in their first-neighbour shells of 0.1 and 0.28 eV respectively. The values of the solubility of tin in 6% and 8% Ni alloys, and 1% and 2% Pd alloys are measured as a function of temperature in the ranges 520-650 degrees C and 950-1150 degrees C respectively. From the slope of the log solubility curve, a heat of formation of the precipitate Ni3Sn2 of 12 kcal per gram atom and of an unidentified PdSn compound of 33 kcal per gram atom is obtained. The presence of a Ni or Pd atom in the first-neighbour shell of a Sn atom makes the hyperfine field at 119sn about 21 kOe more positive; a Ni atom in the second-neighbour shell makes it 23 kOe more negative. Pd atoms in the second-neighbour shell were not observed.