Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 337, Issue -, Pages 277-281Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0925-8388(01)01964-8
Keywords
mixed oxides; thermal expansion; high-temperature XRD
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Earlier it was shown that ThO2 and CeO2 form almost an ideal solid solution throughout the homogeneity range. In this manuscript, we report the lattice thermal expansion behaviour of Th1-xCexO2 (0.0less than or equal toxless than or equal to1.0) in the temperature range from ambient to 1473 K investigated by high-temperature X-ray diffraction. The coefficient of average lattice thermal expansion (a,,) progressively increases on going from ThO2 to CeO2 in Th1-xCexO2. The typical alpha(a) values of ThO2, Th0.5Ce0.5O2 and CeO2 were found to be 9.54 x 10(-6), 10.62 x 10(-6) and 11.5 x 10(-6) K-1, respectively in the temperature range 293-1473 K. Thus the substitution of Ce4+ at Th4+ sites in ThO2 has a systematic influence on the thermal expansion behaviour. These results will be useful in simulating the thermal expansion behaviour of thoria-plutonia mixed oxides. (C) 2002 Elsevier Science B.V. All rights reserved.
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