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Radiation Damage in Materials – Effects of Disorder

Published online by Cambridge University Press:  15 February 2011

Karl R. Whittle ,
Mark G. Blackford ,
Gregory R. Lumpkin ,
Katherine L. Smith  and
Nestor J. Zaluze
Karl R. Whittle
Affiliation:
Institute of Materials Engineering, Australian Nuclear Science and Technology Organisation, PMB1, Menai, NSW 2234, Australia
Mark G. Blackford
Affiliation:
Institute of Materials Engineering, Australian Nuclear Science and Technology Organisation, PMB1, Menai, NSW 2234, Australia
Gregory R. Lumpkin
Affiliation:
Institute of Materials Engineering, Australian Nuclear Science and Technology Organisation, PMB1, Menai, NSW 2234, Australia
Katherine L. Smith
Affiliation:
Institute of Materials Engineering, Australian Nuclear Science and Technology Organisation, PMB1, Menai, NSW 2234, Australia
Nestor J. Zaluze
Affiliation:
Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA
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Abstract

Radiation damage and the effect on physical and chemical properties is an important component in the prediction of the long-term stability of waste form materials. As part of the ongoing goal of increasing the accuracy of long-term predictions of radiation damage, two types of material, based on proposed materials with a waste form application have been irradiated. Results have shown that Y2TiO5 (Y2.67Ti1.33O6.67), and Yb2TiO5 (Yb2.67Ti1.33O6.67), both of which are non-stoichiometric, disordered pyrochlore-based compounds, behave significantly different to the stoichiometric, ordered pyrochlore equivalent. For example the critical temperature, the temperature above which materials remain crystalline during irradiation, is found to decrease from the ordered equivalents, e.g. Y2Ti2O7. A second material based on La2TiO5 has been found to behave differently to both La2/3TiO3 and La2Ti2O7, with a change in Tc of ∼ 200 K.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1193: Scientific Basis for Nuclear Waste Management XXXIII , 2009 , 55
Copyright
Copyright © Materials Research Society 2009

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References

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