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2014 | 126 | 1 | 176-177
Article title

Phase Stability of (Fe_{80}Nb_{6}B_{14})_{0.9}Tb_{0.1} Bulk Nanocrystalline Magnet

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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.
  • Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
  • Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
  • Institut des Molécules et des Matériaux du Mans, UMR CNRS 6283, Université du Maine, 72085 Le Mans cedex 9, France
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