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Self-Diffusion in Chemically Homogeneous Multilayers Using Neutron and Nuclear Resonance Reflectivity

Published online by Cambridge University Press:  01 February 2011

Mukul Gupta ,
Ajay Gupta ,
Sujoy Chakravarty ,
T. Gutberlet ,
H.-C. Wille ,
O. Leupold  and
R. Rüffer
Mukul Gupta
Affiliation:
Laboratory for Neutron Scattering, ETHZ & PSI, Paul Scherrer Institute, Villigen, CH-5232, Switzerland
Ajay Gupta
Affiliation:
Inter University Consortium for DAE facilities, Khandwa Road, Indore, 452017, India
Sujoy Chakravarty
Affiliation:
Inter University Consortium for DAE facilities, Khandwa Road, Indore, 452017, India
T. Gutberlet
Affiliation:
Laboratory for Neutron Scattering, ETHZ & PSI, Paul Scherrer Institute, Villigen, CH-5232, Switzerland
H.-C. Wille
Affiliation:
European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex, France
O. Leupold
Affiliation:
European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex, France
R. Rüffer
Affiliation:
European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex, France
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Abstract

Neutron reflectivity is a well-established technique for studying self-diffusion in chemically homogeneous system as neutron scattering lengths are different for isotopes of an element. For x-ray there is no contrast for a multilayer with isotopic abundance. However, placing Mössbauer active nuclei in a chemically homogeneous system, self-diffusion of the constituents can be probed using nuclear resonance scattering of Mössbauer active nuclei. In the present work, we have applied the neutron reflectivity technique for studying the self-diffusion of iron and nitrogen in nano crystalline multilayers of FeN/57FeN and FeN/Fe15N and nuclear resonance reflectivity techniques for studying iron self diffusion in FeNZr/57FeNZr. Both the techniques are complementary to each other and give a unique depth resolution of the order of 0.1 nm. As compared with conventional techniques used for probing self-diffusion, neutron and nuclear resonance reflectivity techniques can be applied at significantly lower temperatures. On the basis of the obtained results the diffusion mechanism in chemically homogeneous multilayers is discussed in the present work.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 840: Symposium Q – Neutron and X-Ray Scattering as Probes of Multiscale Phenomena , 2004 , Q1.7
Copyright
Copyright © Materials Research Society 2005

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References

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