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1 Materials Science Poland

1 2006

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Evolution of hyperfine parameters in Co-doped FINEMET

Szumiata T, Brzózka K., Górka B., Gawroński M., Pavlík G., Sovák P.

Materials Science Poland

2006

Vol. 24, No. 3

599--603

The influence of Co addition on microstructure and hyperfine parameters of (Fe1-xCox)73.5Cu1Nb3Si13.5B9 alloys has been studied by means of 57Fe Mössbauer spectrometry. In the amorphous ribbons fabricated by melt-spinning technique, the systematic changes of mean hyperfine field and isomer shift with cobalt content have been stated. In the annealed, nanocrystalline samples, the DO3-type structure of Fe(Co)-Si grains evolves into the bcc (Fe,Co)Si substitutional solid solution when increasing x. Simultaneously, the amorphous matrix is depleted in iron and cobalt. The observed increase of mean hyperfine field is attributed to the enrichment of nanocrystallites in magnetic elements as well as segregation of iron.