Magnetic properties, Mössbauer and aftereffect studies of Pr10Fe90−xBx (x=5.88–11.5) nanocomposites

Magnetic properties, phase evolution and aftereffect of melt-spun Pr10Fe90−xBx (x=5.88–11.5) nanocomposite ribbons have been studied. Summarizing the results of thermal magnetic analysis and Mossbauer spectroscopy, two phases, namely Pr2Fe14B and α-Fe, were found for ribbons with x=5.88 and 7.5, while additional two metastable phases, Pr2Fe23B3 and Fe3B, prevailed for x=9. For x=10 and 11.5, only three of these phases: Pr2Fe14B, Pr2Fe23B3, and Fe3B, but not α-Fe were present. The optimal magnetic properties of Br=10.1 kG, iHc=6.4 kOe, and (BH)max=16.1 MGOe were achieved in the Pr10Fe84.12B5.88 ribbon, while iHc 8.71 kOe and (BH)max 14.7 MGOe were obtained in Pr10Fe80B10. Furthermore, Pr10Fe78.5B11.5 having the optimal iHc (9.33 kOe) exhibited minimum values in activation volume V=5.03×10−19 cm3, because it possessed the least volume fraction of the magnetically soft phases. Finally, confirmation of the absence of spin reorientation in Pr2Fe14B down to 5 K assures its advantage over Nd2Fe14B for low-temper...

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