NUKLEONIKA 2007, 52(Supplement 1):S85-S88
Izabela Wnuk, Jerzy J. Wysłocki, Anna Przybył
Institute of Physics, Department of Materials Processing Technology
and Applied Physics, Częstochowa University of Technology,
19 Armii Krajowej Str., 42-200 Częstochowa, Poland
The effect of the contents of the magnetically hard and magnetically soft phases on the magnetic
properties of Nd2Fe14B + a-Fe nanocrystalline magnets,
as produced by the method of mechanical alloying, has been established. The phase composition of
specimens was determined using X-ray diffractometry and Mössbauer spectroscopy. The Mössbauer
examination showed that as the powder milling times increased, the content of the Nd2Fe14B
phase increased from 42.8% (after the milling time of 10 h, with a grain size of 44.8 nm) to 66.3%
(after the milling time of 48 h, with
a grain size of 37.3 nm) and then decreased to 40.3% after 120 h of milling. On the other hand,
the content of the magnetically soft phase a-Fe initially decreased
(from 27.7%), reaching a minimum after the milling time of 48 h (17.4%) and then increasing to 36.9%
after 120 h of milling.