Crystallisation and Phase Decomposition Processes in Pr<SUB>4.5</SUB>Fe<SUB>77</SUB>B<SUB>18.5</SUB> Amorphous Ribbon

Effects of Metastable Phase Formation on the Magnetic Properties of Pr<SUB>4.5</SUB>Fe<SUB>77</SUB>B<SUB>18.5</SUB> Amorphous Ribbons

“…The interphase boundaries among the particles were continuous as far as two-dimensional observation. 17) With increasing annealing time, the amounts of both Pr 2 Fe 14 B and Fe 3 B particles increased as shown in Fig. 5 and the particles were coalesced by further annealing.…”

“…9,11,12) The magnetic properties of these alloys depend on the phases precipitated, the grain size, the distribution and the interphase boundary structures between hard and soft magnetic particles. [13][14][15][16] In the previous study on a Pr 4.5 Fe 77 B 18.5 amorphous ribbon, 17) it has been confirmed that the precipitation sequence during isothermal annealing is; amorphous (Am) → Fe 3 17) The phases in the brackets shows those formed at the prior stage of annealing. The magnetic properties of these nanocomposites vary sensitively with the structural change during isothermal annealing.…”

“…The three particles "b", "c" and "d" were confirmed to be soft magnetic Fe 3 B, Pr 2 Fe 23 B 3 , and Fe 3 B particles, respectively, and the interfaces between them were almost continuous. 17) In the FTP shown in Fig. 3(c), the reflections from a Pr 2 Fe 23 B 3 particle were shown by white squares to discriminate them from the reflections due to the particles in the vicinity of the Pr 2 Fe 23 B 3 .…”

“…Since the X-ray results at various temperatures were shown in the previous study, 17) only those for the ribbons annealed at 750…”

Effects of Cr on the early crystallization stages of Nd4.5Fe77-xCrxB18.5 amorphous ribbons

“…The hard magnetic properties of NdFeB nanocomposites, known as exchange-spring magnets, have been studied extensively [1][2][3][4][5][6][7][8][9][10][11]. Coehoorn et al [1] obtained an M r /M s ratio higher than 0.75 in Nd 4 Fe 78 B 18 nanocomposites and concluded that such a property arises from the exchange coupling interaction between hard and soft magnetic particles.…”