Abstract
Defect structures associated with Sb or In impurity atoms in iron, cobalt, and nickel hosts have been detected by Sn-119 Mossbauer spectroscopy. With substitutional values as reference, the structures found are uniquely characterized by large, positive shifts in the Sn-119 magnetic hyperfine field and correlated increases in isomer shift. Further characterization are lower effective Debye temperatures. Preferably, the defects form and anneal in the resistivity stage III; the specific behaviou depending on whether Sb or In make up their kernel. They are interpreted as unique vacancy-type, relaxed structures SbVn or InVn. The vacancy trapping leads to order-of-magnitude field enhancements in fcc Co and Ni hosts, uniquely reflecting that here the substitutinal Sn fields happen to be small due to almost cancellation of large positive and negative contributions.
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