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Synchrotron x-ray diffraction analysis of gadolinium and lanthanum titanate oxides irradiated by xenon and tantalum swift heavy ions

Published online by Cambridge University Press:  03 March 2015

Sulgiye Park ,
Maik Lang ,
Cameron L. Tracy ,
Fuxiang Zhang ,
Christina Trautmann ,
Zhongwu Wang  and
Rodney C. Ewing
Sulgiye Park
Affiliation:
Department of Geological and Environmental Sciences, Stanford University, Stanford, CA, 94305, USA
Maik Lang
Affiliation:
Department of Nuclear Engineering, University of Tennessee, TN, 37996, USA
Cameron L. Tracy
Affiliation:
Department of Materials Science & Engineering, University of Michigan, Ann Arbor, MI 48109, USA
Fuxiang Zhang
Affiliation:
Department of Earth & Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, USA
Christina Trautmann
Affiliation:
GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany Technische Universität Darmstadt, 64287 Darmstadt, Germany
Zhongwu Wang
Affiliation:
Cornell High Energy Synchrotron Source, Cornell University, Ithaca, NY 14853, USA
Rodney C. Ewing
Affiliation:
Department of Geological and Environmental Sciences, Stanford University, Stanford, CA, 94305, USA
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Abstract

A synthetic cubic pyrochlore, Gd2Ti2O7 (Fd3̅m) irradiated with swift heavy ions is compared with a compositionally-related composition La2Ti2O7 (P21), which has a monoclinic, layered, perovskite-type structure. Irradiation experiments were performed at the GSI Helmholtz Center with 181Ta ions and 129Xe ions at specific energies of 11MeV/amu. At these energies the ions pass entirely through the sample thickness of ∼ 40 μm. Angle-dispersive synchrotron powder x-ray diffraction (XRD) measurements were completed and an increasing ion-induced amorphization with increasing ion fluence was for both phases. The ion track cross-sections for the radiation-induced crystalline-to-amorphous transformation, as determined from the evolution of the integrated peak intensities as a function of fluence, reveal that La2Ti2O7 (track diameter, d ∼ 7.2 nm with 181Ta and 5.1 nm with 129Xe) is more susceptible to amorphization than Gd2Ti2O7 (d ∼ 6.2 nm with 181Ta and 4.6 nm with 129Xe). The radiation response of the two titanate compounds can be understood in the context of their different structures and cation ionic radius ratios rA/rB, where the susceptibility of radiation of titanate pyrochlores is proportionate with this radius ratio. The higher electronic linear energy loss of the 181Ta ions as compared with 129Xe ions leads to a consistent increase of volume amorphized per ion in both materials, which manifests as a larger track diameter.

Keywords

x-ray diffraction (XRD)XeTa
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1743: Symposium DD/WW – Materials and Radiation Effects for Advanced Nuclear Technologies , 2015 , mrsf14-1743-ww13-04
Copyright
Copyright © Materials Research Society 2015 

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