アモルファス合金中の拡散

概要

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The aim of this research is to clarify a quantitative evaluation in the atomic diffusion process forR(R=Dy and Tb)-Fe based amorphous binary alloys focusing on the metallic compound system for Magneto-Optical (MO) recording layers. Tracer 57Co diffusion coefficients in metal type amorphous Tb22Fe78 and Dy25Fe75 amorphous binary alloys, with thickness of typically 0.3mm, prepared by high-rate DC sputtering have been investigated by ion-beam micro-sectioning technique. In the present work, activation energies and pre-exponential factors for diffusion coefficients expressed by linear Arrhenius relationship that depends on annealing temperature and activation energy have been discussed. The magnitudes for the pre-exponential factor and the activation energy show the 57Co diffusion phenomenon with relaxed state and non-relaxed one in amorphous alloys. Another result has been also suggested that the "Lanthanide" system amorphous alloys have lower activation energies than that of the other packed state amorphous alloys and typical crystalline states.
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