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Chromium Diffusion in Sapphire Crystals: Influence of Preannealing Conditions

Published online by Cambridge University Press:  10 February 2011

E. G. Gontier-Moya
Affiliation:
Laboratoire SERMEC, B61, Faculté des Sciences de St Jérôme, 13397-Marseille-Cedex 20-, France
F. Moya
Affiliation:
Laboratoire SERMEC, B61, Faculté des Sciences de St Jérôme, 13397-Marseille-Cedex 20-, France
J. Bigarre
Affiliation:
Laboratoire Matériaux-Mécanique Physique, Ecole Centrale de Lyon, BP 163-69131-Ecully-Cedex, France
D. Juve
Affiliation:
Laboratoire Matériaux-Mécanique Physique, Ecole Centrale de Lyon, BP 163-69131-Ecully-Cedex, France
D. Treheux
Affiliation:
Laboratoire Matériaux-Mécanique Physique, Ecole Centrale de Lyon, BP 163-69131-Ecully-Cedex, France
C. Grattepain
Affiliation:
Laboratoire de Physique des Solides, CNRS, Place Aristide Briand, 92195 -Meudon-Cedex, France
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Abstract

Chromium diffusion coefficients in alumina single crystals were evaluated from penetration profiles determined by the SIMS technique. The samples were previously annealed at 1000°C (1 hour), 1500°C (4 hours), and 1700°C (24 hours). Diffusion experiments were carried out at 1400°C during 10 hours.

The results show that bulk diffusion coefficients are strongly dependent on preannealing conditions (temperature and time): they decrease by more than an order of magnitude when the preannealing temperature is increased from 1000°C to 1700°C.

These results are discussed taking into account the dislocations and point defects in alumina. We consider the role played by the linear defects resulting from surface polishing, as well as point defects associated with impurities. It is found that the lowest defect concentration is achieved after an annealing treatment at 1700°C during 24 hours. The conditions for obtaining a, «reference material» are proposed.

Type
Research Article
Copyright
Copyright © Materials Research Society 1998

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References

REFERENCES

1. Moya, F., Gontier-Moya, E.G., Sami, A., Juve, D., Treheux, D., Grattepain, C. Philosophical Magazine A, 72,861870 (1995)Google Scholar
2-5. Claire, A.D Le and Rabinovith, A. J. Phys. C: Solid State Phys., 14, 38633879 (1981), 15, 3455-3471 (1982), 16, 2087-2104 (1983), 17, 991-1000 (1984)Google Scholar
6. Kaur, I. and Gust, W., Fundamental of grain and interphase grain boundary diffusion, (Ziegler Press, Stuttgart, 1988), p 135142.Google Scholar