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Radiation Damage of Fe-based Nanocrystalline Materials

100%
Sitek J., Dekan J., Pavlovič M.
Acta Physica Polonica A
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2014
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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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Magnetic Properties of Nanocrystalline Alloys after Electrons Irradiation

100%
Sitek J., Holková D., Dekan J., Novák P.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
708-710
EN
Nanocrystalline (Fe₃Ni₁)₈₁Nb₇B₁₂ alloy was irradiated by electron beams of doses up to 4 MGy. Irradiation had an influence on the magnetic microstructure of the studied alloys. It has manifested as a change in the mean orientation of local magnetization, intensity of the internal magnetic field, and distribution function of induction of internal magnetic field. All these parameters were determined from the measured Mössbauer spectra. The mean orientation of local magnetization was the most sensitive parameter. Structural changes were not identified by the Mössbauer spectroscopy and by X-ray diffraction. The results indicated that the changes of the microscopic magnetic parameters induced by irradiation depend on the phase composition. Intensity of internal magnetic field also contributes to resistivity of alloy against radiation.
3
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Characterization of ODS Steels after Gamma Irradiation for Application in ALLEGRO Reactor

100%
Slugeň V., Bartošová I., Dekan J.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
1090-1092
EN
Oxide-dispersion strengthened steels characterization using various spectroscopic techniques is presented. Microstructure of 15% chromium oxide-dispersion strengthened steels was studied in term of vacancy defects presence and their accumulation after defined irradiation treatment, respectively. Studied materials originated from Kyoto University and studied via IAEA collaborative project focused on generation IV reactors (ALLEGRO). Samples were characterized "as received" by positron annihilation lifetime spectroscopy, the Mössbauer spectroscopy and their microstructure was examined by transmission electron microscopy as well. Samples were afterwards irradiated in Washington State University Nuclear Radiation Center via a strong gamma source (6 TBq). Damage induced by gamma irradiation was evaluated by positron lifetime measurements in emphasis on defect accumulation in the materials. We have demonstrated strong defect production induced by gamma irradiation which results from positron measurement data.
4
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Mössbauer Spectroscopy Study of Laboratory Produced ODS Steels

100%
Degmová J., Dekan J., Šimeg Veterníková J., Slugeň V.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
1171-1173
EN
The investigated oxide dispersion strengthened steels were received from laboratories involved in the Coordinated Research Project F11014 "Benchmarking of Structural Materials Pre-selected for Advanced Nuclear Reactors", namely from India (IGCAR), Russia (Bochvar Institute), China (University of Beijing), and Japan (Kyoto University). The application of the Mössbauer spectroscopy on these materials is aimed to reveal the complex information about studied materials via unique characteristics as micromagnetic properties and homogeneity of admixtures distribution in steels. All studied steels mainly differ in content of elements as Cr or Al. Chosen fitting model consists of bcc Fe, bcc Fe with Cr substitution and paramagnetic bcc Cr rich components. These ODS steels are aimed in further study for He implantations.
5
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Thickness Dependence of Mössbauer Parameters for Fe₇₈Si₉B₁₃ Metallic Glass Ribbons

88%
Amini N., Miglierini M., Hasiak M., Dekan J., Habibi S.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
666-668
EN
Changes in magnetic microstructure of Fe₇₈Si₉B₁₃ ribbons were investigated by the Mössbauer spectrometry as a function of their thickness. The latter decreases inversely with the quenching wheel velocity. Amorphicity of the samples was checked by X-ray diffraction and the Mössbauer spectrometry. Average values of hyperfine magnetic fields do not appreciably differ with the production velocity. On the other hand, notable deviations are observed in the position of a net magnetic moment. After annealing with moderate temperature, the magnetic anisotropy improves as indicated by an increase of the average value of hyperfine magnetic field. However, magnetic moments turn out of the ribbon plane and this process continues towards higher production velocity, i.e., smaller thickness of the ribbons. No appreciable deviations in the investigated Mössbauer parameters were revealed after annealing during different time intervals.
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