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Size Effect of Hard Magnetic Properties of Fe-Nb-B-Tb Milled Alloys

100%
Granek K., Ziółkowski G., Chrobak A., Klimontko J., Talik E.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
645-647
EN
The paper refers to magnetic and structural properties of powders made of Fe-Nb-B-Tb ultra-high coercive alloy. The initial alloy was milled in a low energy mill for 1 h and 14 h. With increasing milling time we observed gradual deterioration of hard magnetic properties i.e. the coercive field decreases from 5.51 T to 0.14 T for the bulk alloy and 14 h milled powder, respectively. However, for the 1 h milling time the micrometric powder reveals quite high coercivity of 2.77 T which is promising for possible applications in magnetic composites.
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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.
Acta Physica Polonica A
|
2014
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vol. 126
|
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 Cooling Rate on Magnetic Properties of (Fe_{80}Nb_{6}B_{14})_{1-x}Tb_{x} Type of Bulk Nanocrystalline Alloys

100%
Chrobak A., Ziółkowski G., Haneczok G.
Acta Physica Polonica A
|
2014
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vol. 126
|
issue 1
178-179
EN
The paper refers to magnetic properties of the (Fe_{80}Nb_{6}B_{14})_{1-x}Tb_{x} (x=0.06 and x=0.08) bulk nanocrystalline alloys prepared using the vacuum suction casting technique. The samples were in the form of rods with diameters of d=1.5 mm, 1 mm and 0.5 mm. It was shown that for the alloys with x=0.08 the significant magnetic hardening with the decrease of sample diameter was observed. For d=0.5 mm the coercive field equals 2.46 T and the maximum energy product |JH|_{max}=77.2 kJ/m^{3}.
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