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Experimental and Atomistic Modelling Study of Ion Irradiation Damage in Thin Crystals of the TiO2 Polymorphs

Published online by Cambridge University Press:  01 February 2011

Gregory R Lumpkin ,
Katherine L Smith ,
Mark G Blackford ,
Bronwyn S Thomas ,
Karl Rhys Whittle ,
Darren J Attard ,
Nestor J Zaluzec  and
Nigel A Marks
Gregory R Lumpkin
Affiliation:
greg.lumpkin@ansto.gov.au, ANSTO, Institute of Materials Engineering, Sydney, New South Wales, Australia
Katherine L Smith
Affiliation:
kath.smith@ansto.gov.au, ANSTO, Institute of Materials Engineering, Sydney, New South Wales, Australia
Mark G Blackford
Affiliation:
mark.blackford@ansto.gov.au, ANSTO, Institute of Materials Engineering, Sydney, New South Wales, Australia
Bronwyn S Thomas
Affiliation:
bronwyn.thomas@ansto.gov.au, ANSTO, Institute of Materials Engineering, Sydney, New South Wales, Australia
Karl Rhys Whittle
Affiliation:
karlwhittle@mac.com, United States
Darren J Attard
Affiliation:
dja@ansto.gov.au, ANSTO, Institute of Materials Engineering, Sydney, New South Wales, Australia
Nestor J Zaluzec
Affiliation:
zaluzec@aaem.amc.anl.gov, Argonne National Laboratory, Electron Microscopy Center, Chicago, Illinois, United States
Nigel A Marks
Affiliation:
N.Marks@curtin.edu.au, Curtin University of Technology, Chemistry, Perth, Western Australia, Australia
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Abstract

Thin crystals of rutile, brookite, and anatase were irradiated in-situ with 1.0 MeV Kr using the IVEM-TANDEM facility. Synthetic rutile and cassisterite (SnO2, rutile structure) remained crystalline up to 5 × 1015 ion cm-2 at 50 K. Natural brookite and anatase with low impurity levels became amorphous at 8.1 ± 1.8 × 1014 and 2.3 ± 0.2 × 1014 ions cm-2, respectively, at 50 K. Irradiation at higher temperature revealed Tc = 170 K for brookite and 242 K for anatase. Natural rutile with about 2 wt% impurities became amorphous at 9.4 ± 1.8 × 1014 ions cm-2 at 50 K and has a Tc = 207 K. The available data reveal both a structural effect in the polymorphs with low levels of chemical impurities and a chemical effect in natural rutile specimens containing up to about 1.7 wt% impurities.

Keywords

transmission electron microscopy (TEM)radiation effectssimulation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1124: Symposium Q – Scientific Basis for Nuclear Waste Management XXXII , 2008 , 1124-Q04-09
Copyright
Copyright © Materials Research Society 2009

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References

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