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F-Centers and Oxygen-Interstitials in MgO

Published online by Cambridge University Press:  25 February 2011

C. Scholz  and
P. Ehrhart
C. Scholz
Affiliation:
Inst, für Festkõrperforschung, Forschungszentrum Jülich Postfach 1913, D-5170 Jülich
P. Ehrhart
Affiliation:
Inst, für Festkõrperforschung, Forschungszentrum Jülich Postfach 1913, D-5170 Jülich
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Abstract

MgO single crystals have been irradiated at different temperatures (4 K, 300 K) with electrons of energies varying between 0.3 and 3 MeV. The irradiation induced defects and their reactions during thermal annealing have been investigated by optical absorption spectroscopy and by X-ray diffraction. The relaxation volume (Viel ≈ 1 at.vol. = a3/8) and the migration energy of the interstitial atoms (≈ 1.6 eV) are determined and an ionization induced and thermally assisted migration process is observed for the first time. The relevance of these results for the understanding of the cascade damage observed after neutron- or ion-damage is discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 279: Symposium A – Beam-Solid Interactions–Fundamentals and Applications , 1992 , 427
Copyright
Copyright © Materials Research Society 1993

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