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Radiation Damage of Fe-based Nanocrystalline Materials

100%
Sitek J., Dekan J., Pavlovič M.
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vol. 126
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issue 1
84-85
EN
Nanocrystalline (Fe_{1-x}Ni_{x})_{81}Nb_{7}B_{12} (x=0, 0.25, 0.5, 0.75) and Vitroperm alloys were studied by Mössbauer spectroscopy after neutron irradiation at fluences of 10^{16} n/cm^{2} and 10^{17} n/cm^{2}. From structure analyses, we have identified ferromagnetic bcc-FeNi in nanocrystalline state and partly paramagnetic (Fe-Ni)_{23}B_{6} phase. Neutron irradiation had an influence on the magnetic microstructure, which is manifested in the change of the Mössbauer parameters, such as the direction of net magnetic moment, the intensity of internal magnetic field and the volumetric fraction. The results indicate that the changes of the microscopic magnetic parameters, induced by neutron irradiation, depend on iron and nickel content. Significant radiation damage started at neutron fluence of 10^{17} n/cm^{2}.
2
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Influence of High Energy Heavy Ions on Magnetic Susceptibility of Soft Magnetic Metallic Glasses

76%
Pavlovič M., Miglierini M., Mustafin E., Seidl T., Šoka M., Ensinger W.
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vol. 126
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issue 1
54-55
EN
This contribution presents experimental data concerning the influence of fast heavy ions on magnetic susceptibility of VITROVAC®6025 and VITROPERM®800 metallic glasses. Samples of magnetic ribbons were irradiated with Au, and Ta ions at 11.1 MeV/A (energy per nucleon), and U ions at 5.9 MeV/A. The irradiation fluences varied from 5×10^{10} up to 1.2×10^{13} ions/cm^{2}. Relative change of the samples' magnetic susceptibility after and before irradiation was measured and evaluated as a function of the irradiation fluence. Measurements were done with a commercial Kappa-bridge device. We observed that VITROPERM® showed less change of magnetic susceptibility in comparison with VITROVAC® and this change occurred at higher fluences. This indicates higher radiation hardness of VITROPERM® compared with VITROVAC® against high-energy heavy ions. In addition, heavier ions caused larger change of magnetic susceptibility than the lighter ones and the effect could be roughly scaled with the level of electronic stopping.
3
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Ion Irradiation Studies of Soft Magnetic Metallic Glasses

76%
Pavlovič M., Miglierini M., Mustafin E., Seidl T., Ensinger W., Strašík I., Šoka M.
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issue 5
754-755
EN
Finemet and Vitrovac® 6025 metallic glasses were irradiated by light (N) and heavy (Au and Ta) ions at different energies from 110 keV to 250 MeV/u (MeV per mass unit) and fluences from 1 × 10^{11} ions/cm^2 to 1 × 10^{17} ions/cm^2. They were analysed by the Mössbauer spectrometry and magnetic susceptibility measurements. Qualitative differences were observed between the radiation effects caused by light and heavy ions.
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