NUKLEONIKA 2007, 52(Supplement 1):S47-S50
Tomasz Pikula1, Dariusz Oleszak2, Jan K. ¯urawicz1, El¿bieta Jartych1
1 Department of Experimental Physics,
Institute of Physics, Technical University of Lublin,
38 Nadbystrzycka Str., 20-618 Lublin, Poland
2 Faculty of Materials Science and Engineering,
Warsaw University of Technology, 141 Wo³oska Str., 02-507 Warsaw, Poland
Ternary Co-Fe-Ni alloys were prepared from the elemental powders by the mechanical alloying method.
Structural properties and hyperfine interactions parameters were determined using X-ray diffraction
and Mössbauer spectroscopy. X-ray diffraction proved that during milling Co-Fe-based solid solutions
with b.c.c. lattice were formed in the case of Co40Fe40Ni20 and
Co50Fe40Ni10 alloys, while for Co52Fe26Ni22
and Co65Fe23Ni12 compositions Co-Ni-based solid solutions with
f.c.c. lattice were obtained. Mössbauer spectroscopy revealed similar values of the average
hyperfine magnetic fields for all the alloys. These values corresponded to the different surroundings
of 57Fe isotopes by Co, Fe and Ni atoms, depending on the chemical composition of the alloy.
The possible atomic configurations around 57Fe isotopes were discussed on the basis
of the local environment model under the assumption that only the first nearest neighbours contribute
to the hyperfine magnetic field at 57Fe site.