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An Investigation of the Structural Strains and the Breakdown of Poisson'S Effect in Lattice-Mismatched BCC(110)/FCC(111) Metallic Superlattices

Published online by Cambridge University Press:  25 February 2011

A. Fartash ,
Ivan K. Schuller  and
M. Grimsditch
A. Fartash
Affiliation:
Texas Center for Superconductivity and Department of Physics, Univ. of Houston, Houston, TX 77204
Ivan K. Schuller
Affiliation:
Department of Physics 0319, Univ. of California, San Diego, La Jolla, CA 92093
M. Grimsditch
Affiliation:
Materials Science Division, Argonne National Lab., Argonne, IL 60439
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Abstract

The strain profiles of individual layers of a selected group of stable bcc(110)/fcc(111) metallic superlattices which have been determined by x-ray diffraction methods are compared, and discussed in terms of a number of mechanisms proposed for explaining their anomalous properties. The superlattices in this group are distinguished in terms of a highly anisotropic lattice spacing mismatch of their adjoining bcc and fcc layers (∼20% vs. 3%). The most prominent structural feature of the bcc layers consists of a highly anisotropic in-plane contraction accompanied with a small out-of-plane strain. The fee layers are found to show large out-of-plane expansions which based on their small in-plane expansions cannot be explained within framework of standard elasticity theory.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 280: Symposium B – Evolution of Surface and Thin Film Microstructure , 1992 , 475
Copyright
Copyright © Materials Research Society 1993

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References

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