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1
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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
Content available remote

Microstructural Study of Fe-Si(Ge)-Nb-Cu-B Finemet Alloys

88%
Michalik S., Bednarcik J., Brzózka K., Sovak P., Górka B.
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issue 5
818-819
EN
Structural changes in Finemet based alloys invoked by germanium replacement for silicon were investigated using the X-ray diffraction, the X-ray absorption spectroscopy and the Mössbauer spectroscopy. Ge substitution preserves a nanostructural character of annealed samples at temperature 550°C; specifically the formation of a DO_3-type with about 19 at.% of (Si,Ge) was confirmed. The mean size of nanocrystals was estimated to be about 7 nm.
3
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The Structural Stability of Soft Magnetic Fe-Co-Zr-W-B Metallic Glasses Investigated by the in-situ X-ray Diffraction

88%
Michalik S., Bednarcik J., Pawlik P., Matija R., Sovak P.
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vol. 126
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issue 1
66-67
EN
The atomic structure of as-prepared Fe_{61}Co_{(14-x)}Zr_{5}W_{x}B_{20} (x=1, 2 and 4) ribbon samples and their thermal stability were investigated by in-situ high-energy X-ray diffraction experiments. It was observed that higher W concentration causes the tiny shift of the main peak of the reduced atomic pair distribution function to higher values of interatomic distances and increases the coefficient of volume thermal expansion. The crystallization process occurs in two steps and is qualitatively the same for all studied specimens. Firstly the Fe_{23}B_{6} phase is created and later is transformed to other types of borides together with the creation of a Fe-based phase.
4
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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.
5
Content available remote

Effects of Heavy-Ions on Soft-Magnetic Metallic Glasses Studied by Diffraction of Synchrotron Radiation

88%
Michalik S., Pavlovic M., Gamcova J., Sovak P., Miglierini M.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
657-659
EN
In this work, influence of ²³⁸U swift (5.9 MeV/u) heavy ions on the as-prepared Fe-Cu-Nb-Si-B metallic glass was investigated by in situ temperature X-ray diffraction of synchrotron radiation. It was observed that ion irradiation strongly affected the temperature evolution of the parameters of the first diffuse peak. It is hypothesized that ion irradiation induced structural rearrangement that increased the degree of disorder of the amorphous structure. During heat treatment, structural relaxation and annealing out of this ion-induced degradation took place. Consequently, the original structure was recovered as demonstrated by the behaviour of the first diffuse peak broadening and devitrification process.
6
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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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