MOSSBAUER STUDY OF DILUTE ALLOYS OF IRON.
BALLISTIC RESEARCH LABS ABERDEEN PROVING GROUND MD
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Magnetic ordering in alloys of iron and germanium and iron and tin has been studied by means of the Mossbauer effect. The presence of an impurity in an iron lattice causes a change in the magnetic field at neighboring iron nuclei and therefore changes the hyperfine splitting. Mossbauer absorption spectra in a transmission geometry were used to measure the changes in the hyperfine splitting due to certain numbers and locations of impurities. Assuming the germanium or tin impurities are distributed randomly in the iron lattice and produce localized effects, the spectra of hyperfine splitting were fit to sums of Lorentzian curves. The displacement of a hyperfine splitting spectrum relative to the spectrum for pure iron is proportional to the change in the field. Using nuclear magnetic resonance NMR data for the effects of third, fourth and fifth nearest neighbors the field changes due to first and second nearest neighbors were computed. Author
- Metallurgy and Metallography
- Solid State Physics