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Differential Scanning Calorimetry of Metamict Pu-Substituted Zirconolite*

Published online by Cambridge University Press:  21 February 2011

Dean E. Peterson  and
Frank W. Clinard Jr
Dean E. Peterson
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory, University of California, Los Alamos, NM 87545
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Abstract

Samples of CaPuTi2O7 were prepared by cold pressing and sintering. Plutonium was substituted for zirconium in order to characterize radiation damage effects. The energy stored in a sample which had reached saturation in swelling after storage at ambient temperature was measured with a differential scanning calorimeter. The total energy of 6.6±0.1 cal/g is released over the range 485–715° C. The activation energy of annealing of the damage is 1.22±0.05 eV. The temperature dependence of the rate constant is described by kT= 5.96E4 exp(−1.22/kBT) s−1 where kB and T are the Boltzmann's constant and temperature(K) respectively. A sample stored at 600°C was similarly evaluated and showed no release of stored energy to the precision of the apparatus (±0.1 cal/g). These results are applied to analysis of waste incorporation in Synroc and are correlated with analogous parameters for other materials.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 15: Symposium D – Scientific Basis for Nuclear Waste Management VI , 1982 , 465
Copyright
Copyright © Materials Research Society 1983

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Footnotes

*

Work performed under the auspices of the U. S. Deparment of Energy.

References

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