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Selective Growth Of Decagonal Ai-Co Thin Films By Reactive Diffusion: Kinetic And Thermodynamic Aspects

Published online by Cambridge University Press:  10 February 2011

E. Emeric ,
C. Bergman ,
G. Clugnet  and
P. Gas
E. Emeric
Affiliation:
Centre de Thermodynamique et Microcalorim~trie (UPR - CNRS), 13347-Marseille, F., claire@ctm.cnrs-mrs.fr
C. Bergman
Affiliation:
Centre de Thermodynamique et Microcalorim~trie (UPR - CNRS), 13347-Marseille, F., claire@ctm.cnrs-mrs.fr
G. Clugnet
Affiliation:
Laboratoire de Métallurgie (UMR-CNRS), Fac. des Sciences St Jér^me, 13397- Marseille, F.
P. Gas
Affiliation:
Laboratoire de Métallurgie (UMR-CNRS), Fac. des Sciences St Jér^me, 13397- Marseille, F.
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Abstract

We report on the formation by reactive diffusion of a pure decagonal quasicrystalline film in Al/Co bilayer and multilayer structures of overall composition Al13CO4. We show that this method is highly selective since several stable phases which exist around this composition are never observed. The quasicrystal is not the first reaction product but is obtained as a second reaction step by a peritectoid reaction between Al9Co2 and the remaining cobalt. DSC analysis allows the determination of both the enthalpy of formation of the decagonal quasicrystal (ΔHf = -31500 ± 2000 J/g-atom) and its activation energy of growth (2.6 ± 0.5 eV).

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 553: Symposium LL – Quasicrystals , 1998 , 19
Copyright
Copyright © Materials Research Society 1999

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References

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