MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Chemical Diffusion in L10-Ordered FePt
Ayako KushidaKatsushi TanakaHiroshi Numakura
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2003 Volume 44 Issue 1 Pages 59-62

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Abstract

Diffusion in FePt has been studied with emphasis on the effect of order-disorder transition by interdiffusion experiments below and above the L10–A1 transition temperature. The chemical diffusion coefficient in the disordered state obeys the Arrhenius law with the effective activation energy of 3.1 eV (1 eV=1.6×10−19 J). Anisotropy of diffusion in the ordered state has been examined using monovariant single-crystals of the tetragonal L10 structure. The coefficient of diffusion in the a-axis direction is slightly lower than the extrapolation of the diffusivity from the disordered state, while that of diffusion in the c-axis direction deviates significantly toward lower values. The apparent activation energy for the diffusion in the two directions is 3.2 and 3.8 eV, respectively.

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© 2003 The Japan Institute of Metals and Materials
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