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Coherency Strain Modeling of Elastic Moduli in CU/NB Multilayers

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Abstract

An anomalous decrease in the elastic moduli of Cu/Nb multilayers has been observed via acoustic wave measurements. The decrease occurs for (111) fcc Cu and (110) bcc Nb layered structures with repeat periods between 1 and 5 nm. The coherency strain model has been used to simulate modulus enhancement in noble/transition metal multilayers. This approach addresses the atomic displacements corresponding with the lattice distortions of biaxially stressed layers. Elastic moduli are derived with respect to higher order differentials of a Born-Mayer type potential for nearest neighbor ions. The elastic moduli anomalies of Cu/Nb multilayers will be modelled within this conceptual framework.

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Authors and Affiliations

  1. Lawrence Livermore National Laboratory, Chemistry and Materials Science, P.O. Box 808, Livermore, California, 94550, USA

    A. F. Jankowski

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  1. A. F. Jankowski
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Jankowski, A.F. Coherency Strain Modeling of Elastic Moduli in CU/NB Multilayers. MRS Online Proceedings Library 141, 147–152 (1988). https://doi.org/10.1557/PROC-141-147

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