Thermal and magnetic properties of amorphous Prx(Fe0.8B0.2)1−x

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Abstract
Amorphous ribbons of the composition Prx(Fe0.8B0.2)1–, 0?x?0.30, have been produced by meltspinning onto a copper wheel under argon atmosphere. The alloys were characterized thermally using a DuPont 1090 Thermal Analysis System. The crystallization onset temperature Tx, measured at a heating rate of 20 K/min, has a maximum of 899 K at x = 0.10. Tx equals 696 and 729 K for x = 0 and x = 0.30, respectively. The activation energy of crystallization of 5.4 eV for x = 0.05, dropping to 4.3 eV at x = 0.10, remaining approximately constant betwen x = 0.10 and 0.20, then dropping to 2.7 eV for x = 0.30. There is evidence that the alloys phase‐separate slowly at room temperature, rapidly at elevated temperature. The magnetic moment was measured as a function of applied field at room temperature and at 4.2 K. The saturation moment decreased from 142 to 50.2 emu/gm at room temperature, and from 171.5 to 93.5 emu/gm at 4.2 K. The low temperature moments were strongly time dependent. The room temperature coercive force was too small to measure (<5 Oe).

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