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Multiscale Phenomena in Bruggeman Composites

Published online by Cambridge University Press:  01 February 2011

Ralph Skomski ,
Jiangyu Li ,
Jian Zhou  and
David J. Sellmyer
Ralph Skomski
Affiliation:
Department of Physics and Astronomy and Center for Materials Research and Analysis
Jiangyu Li
Affiliation:
Department of Engineering Mechanics and Center for Materials Research and Analysis, University of Nebraska, Lincoln, NE 68588
Jian Zhou
Affiliation:
Department of Physics and Astronomy and Center for Materials Research and Analysis
David J. Sellmyer
Affiliation:
Department of Physics and Astronomy and Center for Materials Research and Analysis
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Abstract

Mechanical, magnetic, and transport properties of arbitrary inhomogeneous composites are investigated by a Bruggeman-type mean-field approach. The theory yields materials parameters as functions of the volume fractions, geometries, and materials constants of the phases. Each system is described by a single response parameter g, which is equal to the percolation threshold of the composite. For macroscopic systems, the approach yields very simple expressions, but nanoscale and multiferroic effects yield relatively complicated corrections to g. In the respective cases, the parameter g depends on the length scale of the composite and has the character of a combination of magnetic, electric, and mechanical degrees of freedom.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 851: Symposium NN – Materials for Space Applications , 2004 , NN1.7
Copyright
Copyright © Materials Research Society 2005

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