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Structural analysis of Gd2Ce2O7

Published online by Cambridge University Press:  20 February 2015

Maulik K. Patel ,
Gianguido Baldinozzi ,
Jeffery A. Aguiar ,
James A. Valdez ,
Sven C. Vogel  and
Kurt E. Sickafus
Maulik K. Patel
Affiliation:
Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee-37996, USA. Center for Materials Processing, University of Tennessee, Knoxville, Tennessee-37996, USA.
Gianguido Baldinozzi
Affiliation:
Structures, Propriétés et Modélisation des Solides, CNRS UMR 8580, Ecole Centrale Paris, 92295 Châtenay-Malabry, France.
Jeffery A. Aguiar
Affiliation:
National Renewable Energy Laboratory, Golden, Colorado 80401, USA.
James A. Valdez
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Sven C. Vogel
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Kurt E. Sickafus
Affiliation:
Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee-37996, USA.
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Abstract

A complex cerium bearing oxide, Gd2Ce2O7 was synthesized in order to simulate Pu in a fluorite derivative oxide. X-ray diffraction (XRD) data was collected using a lab diffractometer at room temperature and analyzed by Rietveld refinement method using the xnd program. The diffraction pattern obtained from the material could be indexed as a C-type cubic bixbyite crystal structure however several peaks showed peak broadening and could not be accounted for within the single-phase bixbyite model. A full pattern refinement, assuming a possible existence of short order disordered bixbyite regions within an average disordered fluorite phase gave a good fit with the experimental data, providing an estimate for correlation length of those bixbyite regions. Transmission electron microscopy confirms the existence of these correlated domains of disordered bixbyite type phase inside a defect fluorite lattice. Understanding the extent of these domains as a function of composition and the thermal history of the samples may have a profound effect on our understanding of miscibility gaps in Re2O3-CeO2 phase diagrams. These effects could be eventually exploited to design materials with increased radiation resistance, a desired feature for oxide matrices where actinides can be safely disposed.

Keywords

crystallographic structuresinteringx-ray diffraction (XRD)
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1743: Symposium DD/WW – Materials and Radiation Effects for Advanced Nuclear Technologies , 2015 , mrsf14-1743-ww05-03
Copyright
Copyright © Materials Research Society 2015 

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References

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