Hostname: page-component-54dcc4c588-xh45t Total loading time: 0 Render date: 2025-09-24T00:35:40.022Z Has data issue: false hasContentIssue false
  • English
  • Français

Optical and Structural Changes of Fe ImplantedSapphire

Published online by Cambridge University Press:  17 March 2011

Carlos P. Marques ,
Eduardo J. Alves ,
Carl J. McHargue ,
Maria F. da Silva ,
José C. Soares ,
Rosário Correia ,
Manuel J. Soares  and
Teresa Monteiro
Carlos P. Marques
Affiliation:
ITN, Estrada Nacional 10, 2686-953 Sacavém, Portugal CFNUL, Av. Prof. Gama Pinto n° 2, 1649-003 Lisboa, Portugal
Eduardo J. Alves
Affiliation:
ITN, Estrada Nacional 10, 2686-953 Sacavém, Portugal CFNUL, Av. Prof. Gama Pinto n° 2, 1649-003 Lisboa, Portugal
Carl J. McHargue
Affiliation:
Center for Mat. Processing, Univ. of Tennessee, Knoxville, TN 37996-2350, USA
Maria F. da Silva
Affiliation:
ITN, Estrada Nacional 10, 2686-953 Sacavém, Portugal CFNUL, Av. Prof. Gama Pinto n° 2, 1649-003 Lisboa, Portugal
José C. Soares
Affiliation:
ITN, Estrada Nacional 10, 2686-953 Sacavém, Portugal CFNUL, Av. Prof. Gama Pinto n° 2, 1649-003 Lisboa, Portugal
Rosário Correia
Affiliation:
Universidade da Aveiro, Dept. Física, 3810-193 Aveiro, Portugal
Manuel J. Soares
Affiliation:
Universidade da Aveiro, Dept. Física, 3810-193 Aveiro, Portugal
Teresa Monteiro
Affiliation:
Universidade da Aveiro, Dept. Física, 3810-193 Aveiro, Portugal
Get access

Abstract

Single crystalline colorless α-Al2O3 samples wereimplanted with several fluences of Fe+ ions in the range of 1×1016 to 5×1017 Fe+ cm-2 atroom temperature. Optical absorption and luminescence measurements werecarried out before and after annealing in reducing and oxidizingatmospheres. The structural changes were studied with RBS/channeling andx-ray diffraction. After implantation, the damage induces a brownishcoloration in the samples for fluences below 2×1017 Fe+ cm-2. The optical spectra are characterized byan absorption band centered at 200 nm. This band is strongly reduced afterannealing at 1100 °C in reducing atmosphere and a new well-defined banddevelops around 350 nm. This new band shifts to lower values with theimplanted fluence, which is an indication of its correlation with thedimensions of the iron precipitates formed in the implanted region. Theexistence of these precipitates was confirmed by x-ray diffraction and TEM.The samples implanted with fluences above 1×1016 Fe+ cm-2 annealed in oxidizing atmosphere display differentoptical absorption spectra, with respect to those annealed in reducingatmosphere, characterized by an increase in the intensity of the peak at 200nm. Luminescence measurements show the presence of F and F+centers in the samples. The existence of these defects can be explained bythe need of charge compensation and strain release due to the formation ofmixed iron oxide or metallic precipitates.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 647: Symposium O – Ion Beam Synthesis & Processing of Advanced Materials , 2000 , O4.2
Copyright
Copyright © Materials Research Society 2001

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable

References

1. White, C. W., McHargue, C. J., Sklad, P. S., Boatner, L. A., Farlow, G. C., Mat. Sci. Rep. 4, 41 (1989).Google Scholar
2. Alves, E., Silva, M. F. da, Marques, J. G., Soares, J. C., Freitag, K., Nucl. Instr. and Meth. B141, 353 (1998).Google Scholar
3. McHargue, C. J., Alves, E., Silva, M. F. da, Soares, J. C., Nucl. Instr. and Meth. B148, 730 (1999).Google Scholar
4. White, C. W., Boatner, L. A., Sklad, P. S., McHargue, C. J., Rankin, J., Farlow, G. C., Aziz, M. J., Nucl. Instr. and Meth. B32, 11 (1988).Google Scholar
5. Polman, A., J. Appl. Phys. 82, 1 (1997).Google Scholar
6. Bausá, L. E., Vergara, I., Jaque, F., Solé, J. García, J. Phys. Condens. Matter 2, 9919 (1990).Google Scholar
7. Evans, B. D., J. Lumin. 60/61, 620 (1994).Google Scholar
8. Tippins, H. H., Phys. Rev. B 1 (1970) 126.Google Scholar
9. Chen, Y., Abraham, M. M. and Pedraza, D. F., Nucl. Instr. and Meth. B59/60, 1163 (1991).Google Scholar
10. McHargue, C. J., Sklad, P. S., White, C. W., Farlow, G. C., J. Mater. Res. 6, 2145 (1991).Google Scholar