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Radiation Enhanced Diffusion in Mgo

Published online by Cambridge University Press:  16 February 2011

Andrew I. Van Sambeek ,
R.S. Averback ,
C.P. Flynn  and
M.H. Yang
Andrew I. Van Sambeek
Affiliation:
University of Illinois at Urbana-Champaign, Department of Materials Science and Engineering, Urbana, IL 61801.
R.S. Averback
Affiliation:
University of Illinois at Urbana-Champaign, Department of Materials Science and Engineering, Urbana, IL 61801.
C.P. Flynn
Affiliation:
University of Illinois at Urbana-Champaign, Department of Physics, Urbana, IL 61801.
M.H. Yang
Affiliation:
University of Illinois at Urbana-Champaign, Department of Physics, Urbana, IL 61801.
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Abstract

Measurements of marker spreading following 2.0 MeV Kr+ irradiation at 25 to 1300°C have been performed on MgO samples containing O18, Ca and Zn buried tracer atoms. Ion beam mixing at room temperature on both sublattices was approximately 2.0 to 3.0 A5/eV. From 600 to 1000°C, the apparent activation enthalpy for diffusion on the anion sublattice (O18) was 0.35 eV and the diffusion coefficient was linear in the irradiation flux. From 1150 to 1300°C the measured activation enthalpy was 4.1 eV and the diffusion coefficient was proportional to the square root of flux. The measured activation enthalpy on the cation sublattice was roughly 0.30 eV up to 700°C for both Ca or Zn doped samples. Measurable extrinsic thermal diffusion from vacancies present for trivalent impurity charge compensation occurred above this temperature, complicating the analysis at higher temperatures. The observed kinetics in the lower temperature range are most likely controlled by interstitial loop formation. In the higher temperature range, vacancy traps with a binding energy of approximately 2 eV could account for the high activation enthalpy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 373: Symposium Y – Microstructure of Irradiated Materials , 1994 , 293
Copyright
Copyright © Materials Research Society 1995

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References

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