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Ion Beam Irradiation of Lanthanum Compounds in the Series La2O3-TiO2

Published online by Cambridge University Press:  01 February 2011

Karl Whittle ,
Mark Blackford ,
Robert Aughterson ,
Katherine L Smith ,
Gregory R Lumpkin  and
Nestor J Zaluzec
Karl Whittle
Affiliation:
karlwhittle@me.com, ANSTO, IME, New Illawara Road, Sydney, New South Wales, 2234, Australia
Mark Blackford
Affiliation:
mgb@ansto.gov.au, ANSTO, Institute of Materials Engineering, PMB1, Sydney, New South Wales, 2234, Australia
Robert Aughterson
Affiliation:
roa@ansto.gov.au, ANSTO (Australian Nuclear Science and Technology Organisation), Institute of Materials Engineering, New Illawarra Road, Lucas Heights, NSW, Australia, 2234, Lucas Heights, New South Wales, 2234, Australia
Katherine L Smith
Affiliation:
kls@ansto.gov.au, ANSTO, Institute of Materials Engineering, Sydney, New South Wales, Australia
Gregory R Lumpkin
Affiliation:
greg.lumpkin@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
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Abstract

Thin crystals of La2O3, La2/3TiO3, La2TiO5, and La2Ti2O7 have been irradiated in situ using 1 MeV Kr2+ ions in the Intermediate Voltage Electron Microscope-Tandem User Facility (IVEM-Tandem), at the Argonne National Laboratory (ANL). We observed that La2O3 remained crystalline to a fluence greater than 3.1 × 1016 ions cm-2 at a temperature of 50 K. The four binary oxide compounds in the two systems were observed through the crystalline-amorphous transition as a function of ion fluence and temperature. Results from the ion irradiations give critical temperatures for amorphisation (Tc) of 840 K for La2Ti2O7, 865 K for La2/3TiO3, and 1027 K for La2TiO5. The Tc values observed in this study, together with previous data for TiO2, are discussed with reference to the phase diagrams for La2O3-TiO2 systems and the different local environments within the crystal structures. Results suggest an observable inverse correlation between Tc and melting temperature (Tm) in the two systems.

Keywords

ion-implantationradiation effectstransmission electron microscopy (TEM)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1265: Symposium AA – Scientific Basis for Nuclear Waste Management XXXIV , 2010 , 1265-AA08-05-BB07-05
Copyright
Copyright © Materials Research Society 2010

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