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Influence of Ball Milling on the Local Atomic Structure of an Amorphous CoFeSiB Alloy

100%
Bednarcik J., Michalik S., Kollar P., Roth S.
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issue 5
825-826
EN
It follows from experimental observations that ball milling induces substantial changes in an amorphous Co_{70.3}Fe_{4.7}Si_{10}B_{15} (at.%) alloy. X-ray diffraction indicates formation of nanocrystalline bcc-(Co,Fe) phase during ball milling. As a consequence crystallization sequence is altered and the total enthalpy of crystallization reduces with the milling time. Furthermore thermomagnetic measurements reveal that specific magnetization and Curie temperature of amorphous phase are influenced by ball milling.
2
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Structure and Magnetic Properties οf Fe(Mn)-Si-B-Nb-Cu Alloys

88%
Michalik S., Sovak P., Bednarcik J., Kollar P., Girman V.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
399-402
EN
According to high energy X-ray diffraction measurements no significant changes were observed in a short range atomic order of amorphous ribbons Fe_{73.5-x}Mn_xCu_1Nb_3Si_{13.5}B_9 (x=1 up to 15 at.%). Thermal stability of the as-prepared alloys was investigated by differential scanning calorimetry and by in situ X-ray diffraction measurements. The two-step crystallization process was revealed, crystallization temperatures T_{x1} and T_{x2} were influenced by Mn content (thermal separation between T_{x1} and T_{x2} completely vanished for x=9). Nanocrystalline state of annealed samples was confirmed by electron transmission microscopy. The influence of Mn substitution on magnetic properties was confirmed by thermomagnetic measurements.
3
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Influence of Zn on Structure and Magnetic Properties of Rapid Quenched (Fe-Zn)-Cu-Nb-Si-B Alloys

76%
Kolesar V., Michalik S., Kovac J., Girman V., Sovak P., Kollar P.
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issue 5
790-791
EN
The aim of this work was to study the influence of Zn on the formation of nanostructure in Fe_{73.5 - x}Zn_xCu_1Nb_3Si_{13.5}B_9 (x = 1, 3, 5) ribbons prepared by the melt-spinning technique. X-ray diffraction measurements proved amorphous state of the sample with x = 1. The sample with x = 3 contains a small fraction of Fe_3Si phase and the sample with x = 5 is in nanocrystalline state with the average grain size of about 25 nm. The reduced radial distribution function G(r) was calculated for local structure investigation. Increasing Zn content enhances crystallization during solidification which leads to increase of magnetocrystalline anisotropy and consequently to increase of coercivity.
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