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Phase Transitions During Ion-Beam Irradiation of the Perovskite-structure Oxides

Published online by Cambridge University Press:  10 February 2011

A. Meldrum ,
L. A. Boatner  and
R. C. Ewingt
A. Meldrum
Affiliation:
Oak Ridge National Laboratory, Solid State Division, MS-6057, Oak Ridge, TN 37831.
L. A. Boatner
Affiliation:
Oak Ridge National Laboratory, Solid State Division, MS-6057, Oak Ridge, TN 37831.
R. C. Ewingt
Affiliation:
The University of Michigan, Dept. of Nuclear Engineering and Radiological Sciences, Ann Arbor, MI 48109-2104
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Abstract

Several perovskite-structure oxide compounds, including CaTiO3, SrTiO3, BaTiO3, KNbO3, and KTaO3 were irradiated by 800 keV Kr+ ions in order to investigate and compare their response to heavy-ion irradiation. The critical amorphization temperature Tc, above which amorphization could not be induced, was found to increase in the order SrTiO3 → CaTiO3 → BaTiO3 → KNbO3 → KTaO3. No single physical parameter explains the observed sequence, although Tc correlates well with the melting temperatures. The well-known solid state phase transformations in these materials did not have a significant effect on the dose required for amorphization. Domain boundaries were observed in the pristine samples; however, after only a low dose, the boundaries became poorly defined and, with increasing dose, eventually disappeared. Dislocation loops were observed to aggregate at the domain boundaries.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 481: Symposium P – Science and Technology of Semiconductor Surface Preparation , 1997 , 401
Copyright
Copyright © Materials Research Society 1998

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References

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