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A new diffusion mechanism for self-compensating impurities in α-alumina

  • Eliette-Geneviève Gontier-Moya , Fernand Moya und Jean Bernardini EMAIL logo
Veröffentlicht/Copyright: 15. Februar 2022
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International Journal of Materials Research
Aus der Zeitschrift International Journal of Materials Research Band 95 Heft 10

Abstract

Cation diffusion in α-alumina has been the subject of recent investigations, self-diffusion by the radiotracer technique and impurity diffusion by the SIMS technique. A review of the data is carried out to clarify the bulk diffusion mechanisms. Aluminium, cobalt, chromium, and yttrium exhibit a “normal” behaviour, which can be accounted for by an extrinsic vacancy diffusion mechanism. Silver, copper, and platinum behave as “fast diffusers”, although their activation energies are close to those of the other elements. From new experiments on magnesium diffusion reported in this paper, it is suggested that fast diffusion can be traced to self-compensating impurities. A diffusion mechanism which reconciles all the observations is proposed for these elements.

Keywords: α-alumina; Fast diffusion; Diffusion mechanism; Self-compensation
Dr. Jean Bernardini L2MP, case 142 Faculté de St Jérôme, 13397 Marseille Cedex 20, France Tel.: +33 4 91 28 8566 Fax: +33 4 91 28 8314

Acknowledgement

The works reported in this paper have been supported by many discussions and collaborations. We would like to thank especially Gabor Erdélyi, Chantal Grattepain, Denise Juvé, Bernard Lesage, Abderrhamane Si Ahmed, and Daniel Treheux for their valuable contributions. This research has benefited from the stimulating atmosphere created by the “Defects and Diffusion” international community. We are happy to take this opportunity to congratulate an eminent member of this community, Professor Helmut Mehrer, University of Münster, Germany, on his birthday.

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Received: 2004-06-02
Accepted: 2004-07-14
Published Online: 2022-02-15

© 2004 Carl Hanser Verlag, München

Artikel in diesem Heft

  1. Contents
  2. Editorial
  3. Helmut Mehrer 65 Years
  4. Articles Basic
  5. Diffusion in intermetallic compounds: the ordered Cu3Au rule, its history
  6. Live long and prosper: Long positronium lifetimes in borate glasses
  7. Atomic defects and diffusion in intermetallic compounds with D03 structure: an ab-initio study
  8. Relationships between chemical and tracer diffusion coefficients in strongly ionic crystals
  9. Formation volume of atomic vacancies in body-centred cubic metals
  10. “Order-order” relaxations in intermetallics
  11. A new diffusion mechanism for self-compensating impurities in α-alumina
  12. Self-diffusion behaviour and microstructure of ultrafine-grained Nd2Fe14B with intergranular melting transition
  13. Tracer diffusion in Pt3Fe ordered alloys
  14. Intermetallic growth and Kirkendall effect manifestations in Cu/Sn and Au/Sn diffusion couples
  15. Ionic conductivity of a fragile glass-forming molten salt: Modelling its dependence on frequency, temperature, and pressure
  16. Some novel applications of sputtering techniques for diffusion studies in solids
  17. Grain boundary faceting close to the Σ3 coincidence misorientation in copper
  18. Grain boundary self-diffusion in α-iron of different purity: effect of dislocation enhanced diffusion
  19. Connection between Fe grain boundary segregation in Al and phase formation in the bulk
  20. Diffusion in metallic glasses and undercooled metallic melts
  21. Sculptures depicting the physical processes which govern the plastic deformation of metals and alloys
  22. Notifications/Mitteilungen
  23. Personal/Personelles
  24. Conferences/Konferenzen
https://doi.org/10.1515/ijmr-2004-0166
Schlagwörter für diesen Artikel
α-alumina; Fast diffusion; Diffusion mechanism; Self-compensation

Artikel in diesem Heft

  1. Contents
  2. Editorial
  3. Helmut Mehrer 65 Years
  4. Articles Basic
  5. Diffusion in intermetallic compounds: the ordered Cu3Au rule, its history
  6. Live long and prosper: Long positronium lifetimes in borate glasses
  7. Atomic defects and diffusion in intermetallic compounds with D03 structure: an ab-initio study
  8. Relationships between chemical and tracer diffusion coefficients in strongly ionic crystals
  9. Formation volume of atomic vacancies in body-centred cubic metals
  10. “Order-order” relaxations in intermetallics
  11. A new diffusion mechanism for self-compensating impurities in α-alumina
  12. Self-diffusion behaviour and microstructure of ultrafine-grained Nd2Fe14B with intergranular melting transition
  13. Tracer diffusion in Pt3Fe ordered alloys
  14. Intermetallic growth and Kirkendall effect manifestations in Cu/Sn and Au/Sn diffusion couples
  15. Ionic conductivity of a fragile glass-forming molten salt: Modelling its dependence on frequency, temperature, and pressure
  16. Some novel applications of sputtering techniques for diffusion studies in solids
  17. Grain boundary faceting close to the Σ3 coincidence misorientation in copper
  18. Grain boundary self-diffusion in α-iron of different purity: effect of dislocation enhanced diffusion
  19. Connection between Fe grain boundary segregation in Al and phase formation in the bulk
  20. Diffusion in metallic glasses and undercooled metallic melts
  21. Sculptures depicting the physical processes which govern the plastic deformation of metals and alloys
  22. Notifications/Mitteilungen
  23. Personal/Personelles
  24. Conferences/Konferenzen
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