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On the chemical diffusion in layered thin films containing amorphous Co–Zr, Ni–Zr, and Fe–Zr

Published online by Cambridge University Press:  31 January 2011

N. Karpe ,
J. B⊘ttiger ,
A.L. Greer ,
J. Janting  and
K. Kyllesbech Larsen
N. Karpe
Affiliation:
Institute of Physics, University of Aarhus, DK-8000 Aarhus C, Denmark
J. B⊘ttiger
Affiliation:
Institute of Physics, University of Aarhus, DK-8000 Aarhus C, Denmark
A.L. Greer
Affiliation:
Department of Materials Science and Metallurgy, University of Cambridge, Cambridge CB2 3QZ, United Kingdom
J. Janting
Affiliation:
Institute of Physics, University of Aarhus, DK-8000 Aarhus C, Denmark
K. Kyllesbech Larsen
Affiliation:
Institute of Physics, University of Aarhus, DK-8000 Aarhus C, Denmark
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Abstract

The chemical diffusion in thin trilayer films of TM–TM100−xZrx–TM with an amorphous middle layer where TM = Co, Ni, or Fe and in amorphous Fe–Zr and Ni–Zr films with composition gradients has been investigated using Rutherford backscattering spectrometry. The growth of the amorphous layer in the trilayers, due to in-diffusion of cobalt and nickel, is initially found to be proportional to the square root of the time, t1/2, and subsequently found to level off before the compositions corresponding to metastable equilibria are reached. Irradiation, with 500 keV Xe+ ions, is found to promote the in-diffusion. This behavior is discussed in terms of structural relaxation effects and their influence on the metastable equilibrium. In amorphous Fe–Zr the chemical diffusivity is observed to be very sluggish. Contrary to the behavior in Co–Zr and Ni–Zr trilayers, the direction of the iron diffusion in Fe–Zr trilayers suggests a broad positive peak in the Gibbs free energy at a composition around 50 at. % Zr. It is argued that the sluggish chemical diffusivity of iron is directly related to the unusual composition-dependence of the Gibbs free energy for amorphous Fe–Zr.

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Articles
Information
Journal of Materials Research , Volume 7 , Issue 4 , April 1992 , pp. 926 - 933
Copyright
Copyright © Materials Research Society 1992

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