Abstract
The evolution of hyperfine interactions with temperature is studied for Fe80M7Cu1B12(M = Mo,Nb and Ti) nanocrystalline alloys with the help of 57FeMössbauer spectrometry. The nanocrystalline structure features anamorphous residual matrix surrounding the crystalline nanograins of bcc-Fe.In addition, interfacial regions comprising atoms located on the surface ofnanocrystals are considered. Special attention is paid to the temperaturebehaviour of hyperfine magnetic fields of the nanograins. The temperaturedependence of hyperfine magnetic fields pointed out significant differencesbetween bulk and nanosized bcc-Fe, suggesting a decrease in the correspondingmagnetic ordering temperature. The higher the crystalline content is,the lower the difference between the hyperfine fields of bulk bcc-Fe andnanocrystalline Fe grains. This tendency is observed for M = Nband Ti whereas it is completely opposite for M = Mo.The present results are explained in terms of mechanical stresses induced duringthe transformation from the amorphous to the nanocrystalline state, thusexcluding a significant number of impurities diffused into the nanocrystallinegrains.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
