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High Temperature Studies of Stoichionetric Cerium Dioxide

Published online by Cambridge University Press:  26 February 2011

J. Faber  and
R. L. Hitterman
J. Faber
Affiliation:
Argonne National Laboratory, Materials Science Div., Argonne, IL, 60439
R. L. Hitterman
Affiliation:
Argonne National Laboratory, Materials Science Div., Argonne, IL, 60439
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Abstract

High-resolution, neutron time-of-flight Bragg scattering measurements have been carried out on polycrystalline CeO2 as a function of temperature (20<T<1200C). Systematic deviations between theory and experiment for the integrated intensities of the Bragg reflections were observed; these deviations increased with increasing temperature. The deviations result from cubic anharmonic interactions that appear only on the oxygen sublattice. The results are discussed in terms of higher order cumulant tensor representations. We observe that these anharmonic interactions exhibit the same symmetry as those associated with defects incorporated into the fluorite lattice when CeO2 is made nonstoichiometric.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 82: Symposium I – Characterization of Defects in Materials , 1986 , 95
Copyright
Copyright © Materials Research Society 1987

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References

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