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Thermal And Electronic Properties Of An AICoFeCr Approximant Of The Decagonal Phase

Published online by Cambridge University Press:  10 February 2011

P. Archambault ,
P. Plaindoux ,
E Belin-Ferre  and
J. M. Dubois
P. Archambault
Affiliation:
LSG2M and GDR CINQ, Centre d'Ingénierie des Matériaux, Ecole des Mines de Nancy, Parc de Saurupt, F-54042 Nancy Cedex
P. Plaindoux
Affiliation:
LSG2M and GDR CINQ, Centre d'Ingénierie des Matériaux, Ecole des Mines de Nancy, Parc de Saurupt, F-54042 Nancy Cedex
E Belin-Ferre
Affiliation:
LCPMR and GDR CINQ, Université Pierre et Marie Curie, 11 rue Pierre et Marie Curie, F- 75231 Paris Cedex 05
J. M. Dubois
Affiliation:
LSG2M and GDR CINQ, Centre d'Ingénierie des Matériaux, Ecole des Mines de Nancy, Parc de Saurupt, F-54042 Nancy Cedex
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Abstract

We have studied the dependence versus nominal composition and temperature of the thermal conductivity in the AlCoFeCr system close to the region where an approximant of the decagonal phase forms. This compound of the Al5Co2 type shows a melting temperature above 1100°C and is of interest because it dispays low thermal conductivity whereas its expansion coefficient is comparable to those of metallic substrates. Used as a coating, it is of potential value for the sake of producing thermal barriers. From a study of the occupied band by X-ray emission spectroscopy, we show that its poor thermal conductivity above room temperature fits with the recurrent localization scheme of electronic states.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 553: Symposium LL – Quasicrystals , 1998 , 409
Copyright
Copyright © Materials Research Society 1999

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References

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