FeCo合金の等速昇温規則化に伴う電気抵抗変化

抄録

The temperature derivative of electrical resistivity, α_R, in an FeCo alloy was measured with a constant rate of increasing temperature, and the residual resistivity was also measured at the liquid-nitrogen temperature as a function of quenching temperature. We proposed a kinetic equation for α_R, which includes the change of vacancy concentration and the degree of order S with the annealing time, and then analyzed the experimental results by using the equation. It was found that the electrical resistivity and the residual resistivity decrease approximately in proportion to S². The electrical resistivity by magnetic scattering, however, hardly decreases with increasing S. Further, α_R caused by only the ordering, or Δα_R, was estimated by eliminating other effects, namely the magnetic and phonon scattering effects in disordered alloys. The observed Δα_R was analyzed by our kinetic equation, and the behavior of Δα_R on isochronal ordering was interpreted satisfactorily.