Abstract
The Mossbauer spectra of 119Sn in face-centred cubic copper manganese alloys containing from 3 at.% to 97 at.% Mn have been obtained at 300 °K, 77 °K and 42 °K, and the appearance of hyperfine fields at 119Sn nuclei as the temperature was reduced has been used to define ordering temperatures. Long range magnetic ordering has been observed in all alloys, the distributions of hyperfine fields and the ordering temperatures reflecting the change in magnetic structure at 75% Mn. The ordering is discussed. The isomer shifts for 119Sn in copper and gamma manganese with respect to white tin were determined as −083 ± 001 mm s−1 and −0.91 ± 0.02 mm s−1 respectively, and the hyperfine field at 119Sn in pure gamma manganese was found by extrapolation to be 255 ± 5 kOe.
Published Version
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