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Sol-Gel Routes towards Magnetic Nanocomposites with Tailored Microwave Absorption

Published online by Cambridge University Press:  10 February 2011

Ph. Colomban  and
V. Vendange
Ph. Colomban
Affiliation:
ONERA, OM, BP72, 92322 Chatillon, France CNRS, LASIR, 2 rue Henri Dunant, 94320 Thiais, France
V. Vendange
Affiliation:
ONERA, OM, BP72, 92322 Chatillon, France
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Abstract

Ceramic microwave absorbents are of considerable interest for the structural applications with the tailored radar cross-section. The main parameters governing the electromagnetic cross-section are discussed in this paper with the specific interest of the dispersion of Co, Fe (and their alloys) particles in a dielectric aluminosilicate matrix (high Curie temperature, significant absorption in the 0.1–15GHz range) and the advantages of the sol-gel routes for the materials preparation. Three methods have been examined: (i) the first one is the mixing of the (sub)micronic metal powder within a liquid matrix precursor; (ii) the second is the mixing of the alkoxides with an aqueous solution of metal ions; and (iii) the third is the preparation of a porous host matrix impregnated by a concentrated solution of transition metal nitrates. Nanocomposites with diameter 20–200nm were achieved by heating at temperatures between 600 and 1100°C under a H2 atmosphere. The samples were characterized by SEM, TEM, magnetic hysteresis, Mössbauer and Raman spectroscopies and microwave absorption.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 457: Symposium V – Nanophase and Nanocomposite Materials II , 1996 , 451
Copyright
Copyright © Materials Research Society 1997

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References

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