A study of Moessbauer spectroscopy of microcrystallization of amorphous Fe73.5Cu1Nb3Si13.5B9 irradiated by a CO2-laser

Microcrystalline phases were produced by laser irradiation on the Fe73.5Cu1Nb3Si13.5B9 amorphous ribbon with a power ranging from 40 to 170 W, scanning speed 10 mm/s, laser beam spot 20 mm. Hyperfine structures of the original and crystallized samples were analyzed by transmission Moessbauer spectroscopy. We discovered that the basic parameters of the Moessbauer spectra--isomer shift (IS), quadrupole splitting (QS) and hyperfine magnetic field (Hhf) change with the laser power. Experimental results show that the magnetic moment reorganization of Fe73.5Cu1Nb3Si13.5B9 amorphous phases has taken place and the atom magnetic moment direction maintains of preferred in-plane orientation. The average hyperfine magnetic field of the amorphous phase is improved because of the microcrystalline phase. The crystallized phase was Fe-Si alloy with a DO3 structure, and the area of its spectral lines is about 2%-3.4%. This is caused by the jump of one electron in Fe atom 3d6 shell into Si atom 3p2 shell, forming a stability electron group