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Damage Evolution and Annealing of Au-Irradiated Samarium Titanate Pyrochlore

Published online by Cambridge University Press:  01 February 2011

Y. Zhang ,
V. Shutthanandan ,
S. Thevuthasan ,
D. E. McCready ,
J. Young ,
R. Devanathan ,
J. Andreasen ,
G. Balakrishnan ,
D. M. Paul  and
W. J. Weber
Y. Zhang
Affiliation:
Pacific Northwest National Laboratory, Richland, WA, USA
V. Shutthanandan
Affiliation:
Pacific Northwest National Laboratory, Richland, WA, USA
S. Thevuthasan
Affiliation:
Pacific Northwest National Laboratory, Richland, WA, USA
D. E. McCready
Affiliation:
Pacific Northwest National Laboratory, Richland, WA, USA
J. Young
Affiliation:
Pacific Northwest National Laboratory, Richland, WA, USA
R. Devanathan
Affiliation:
Pacific Northwest National Laboratory, Richland, WA, USA
J. Andreasen
Affiliation:
Physics Department, Northwestern University, Evanston, IL, USA
G. Balakrishnan
Affiliation:
Department of Physics, University of Warwick, Coventry, UK
D. M. Paul
Affiliation:
Department of Physics, University of Warwick, Coventry, UK
W. J. Weber
Affiliation:
Pacific Northwest National Laboratory, Richland, WA, USA
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Abstract

Damage evolution and thermal recovery of 1 MeV Au2+ irradiated samarium titanate pyrochlore (Sm2Ti2O7) single crystals were studied by Rutherford backscattering spectroscopy and nuclear reaction analysis. The damage accumulation follows a nonlinear dependence on dose that is well described by a disorder accumulation model, which indicates a predominant role of defect-stimulated amorphization processes. The critical dose for amorphization at 170 and 300 K is ∼0.14 dpa, and a higher dose of ∼ 0.22 dpa is observed for irradiation at 700 K, which agrees with previous in-situ transmission electron microscopy (TEM) data for polycrystalline Sm2Ti2O7. Annealing in an 18O environment reveals a damage recovery stage at ∼ 850 K that coincides with a significant increase in 18O exchange due to oxygen vacancy mobility. This thermal recovery stage is also consistent with the critical temperature for amorphization measured by in-situ TEM in polycrystalline samples.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 792: Symposium R – Radiation Effects and Ion Beam Processing of Materials , 2003 , R2.4
Copyright
Copyright © Materials Research Society 2004

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