Abstract
Amorphous Pr2Fe14B was produced by the melt-spinning technique and subsequent nanocrystallization was carried out by isothermal annealing. The free volumes in amorphous and in nanocrystalline Pr2Fe14B have been characterized using positron lifetime spectroscopy. The two primary lifetime components were ascribed to vacancy-type defects in the intergranular layers or the interfaces of the crystallites and to large free volumes of the size of several missing atoms, e.g., in triple junctions. The increase of the intensity ratio I1/I2 of the positron lifetime components with increasing crystallite size confirms the picture that the positrons are annihilated in the free volumes of grain boundaries and that of triple junctions.
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