| The crystallization mechanism of amorphous Fe-P alloys has been investigated through the differential thermal analysis, the X-ray diffraction, and the change of the electrical resistance to temperature and time variations. 1) The crystallized products were α-Fe(bcc, a=2.86Å) and Fe₃P(bct, a=9.llÅ, c=4.46Å, c/a=0.490) regardless of the concentration range of amorphous Fe-P alloys. 2) Crystallization temperature of the three amorphous samples, Fe_(84)P_(16), Fe_(83)P_(17) and Fe-(82)P_(18) measured by the DTA and resistance methods were 368℃, 373℃, and 377℃ respectively. 3) The crystallization process of the amorphous Fe-P alloy was different according to the phosphorous concentration. The process of Fe_(84)P_(16) and Fe_(83)P_(17) was based on the auto-catalysis but that of Fe_(82)P_(18) was on the nucleation and grain growth. Activation energies for the crystallization were computed as 37.3 ㎉/㏖ for Fe_(84)P_(16), 38.3 ㎉/㏖ for Fe_(83)P_(17) and 40.6 ㎉/㏖ for Fe_(82)P_(18), individually. |
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