Science of Sintering (Jan 2004)

Influence of the changes of free electron density on electrical and magnetic properties of the CO70Fe5Si10B15 amorphous alloy

  • Maričić Aleksa M.,
  • Minić-Popović Dragica M.,
  • Zak T.

DOI
https://doi.org/10.2298/SOS0403197M
Journal volume & issue
Vol. 36, no. 3
pp. 197 – 203

Abstract

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In this study we present the results on structural relaxation of the Co70Fe5Si10B15 amorphous alloy investigated by measuring the thermo-electromotive force (TEMF) during isothermal annealing (for 600 s). A mechanical junction of the investigated alloy and a copper conductor has been constructed for measuring the thermo-electromotive force (ε). Annealing was performed at temperatures T1 = 430˚C, T2=460˚C and T3=480˚C which are about 50 to 100˚C lower than the crystallization temperature. At these temperatures structural relaxation occurred only in the amorphous alloy. The activation energy E=224 kJ/mol and rate constants k1=6.66·10-5 s-1 k2=33·10-5 s-1 and k3=76·10-5 s-1 at temperatures T1, T2 and T3 respectively, have been determined for the process. Each isothermal annealing has been followed by determination of the relative change of the electronic state density at the Fermi level as Dn1/n=2.36%, Dn2/n =3.21% and Dn3/n= 9.80%, respectively. .

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