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Phase Structure and Magnetic Properties of Fe-Nb-B-Pt Type of Bulk Nanocrystalline Alloys

100%
Ziółkowski G., Chrobak A., Randrianantoandro N., Klimontko J.
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vol. 126
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issue 1
174-175
EN
The paper refers to magnetic and structure properties of the (Fe_{80}Nb_{6}B_{14})_{1-x}Pt_{x} (x=0.15, 0.3, 0.4 and 0.6) bulk nanocrystalline alloys prepared using the vacuum suction casting technique. The samples were in the form of rods with diameters ranging from 0.5 mm to 1.5 mm. It was shown that the optimal Pt content is x=0.4 with the coercive field equal to 0.2 T and maximum energy product |BH|_{max}=11.2 kJ/m^{3}. The magnetic properties can be associated with Fe-Pt, Fe and Fe-B phases, depending on the alloy composition.
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Phase Stability of (Fe_{80}Nb_{6}B_{14})_{0.9}Tb_{0.1} Bulk Nanocrystalline Magnet

100%
Chrobak A., Ziółkowski G., Randrianantoandro N.
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vol. 126
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issue 1
176-177
EN
The paper refers to phase stability of the (Fe_{80}Nb_{6}B_{14})_{0.9}Tb_{0.1} bulk nanocrystalline alloys prepared using the vacuum suction casting technique. The samples were in the form of rods with diameters d=2, 1.5, 1 and 0.5 mm. Heating up to 900 K reveals structural changes that occur at temperatures above 680 K (DSC and M(T) measurements). The phase analysis, using Mössbauer spectra, indicates the decrease of Tb_{2}Fe_{14}B and increase of Fe content in the samples after the heat treatment. The most stable is the alloy with d=1 mm, where the formation of α-Fe phase was not observed. The decrease of d causes significant hardening i.e. coercive field increases from 0.57 T to 2.66 T for d=2 mm and d=0.5 mm, respectively.
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Influence of Transition and Rare Earth Elements on Magnetic Properties of Fe-Nb-B-M (M~=~Ni, Ag, Gd,~Tb) Bulk Nanocrystalline Alloys

76%
Ziółkowski G., Randrianantoandro N., Chrobak A., Klimontko J., Kądziołka-Gaweł M., Haneczok G.
Acta Physica Polonica A
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2012
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vol. 121
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issue 5-6
1266-1269
EN
In this work we present magnetic properties of the (Fe_{80}Nb_6B_{14})_{1-x}M_x (where M = Ni, Ag, Gd, Tb and x = 0.08, 0.16, 0.32) bulk nanocrystalline alloys prepared by making use of mould casting technique. The applied preparation technique is favorable to nanocrystallization of the alloys with mean diameters of crystallites ranged from about 10 nm to 30 nm. Phase identification reveals a formation of ternary RE_2Fe_{14}B and binary REFe_2 phases dependently on the alloy composition. It was found that for the alloys with Ag addition magnetic moment of Fe atom increases from 2.26 μ_{B} to 3.36 μ_{B} for x = 0.08 and x = 0.32, respectively. For Ni addition this quantity decreases with increasing x due to appearing of Fe-Ni (fcc) phases. For Gd, Tb additions the alloys are ferrimagnetic with compensation composition ranged between x = 0.08 and x = 0.16. The both rare earth alloying additions cause a significant magnetic hardening especially in the case of Tb.
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