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Structural Changes in 238Pu-Substituted Zirconolite on Recovery from the Metamict State

Published online by Cambridge University Press:  28 February 2011

F. W. Clinard Jr. ,
R. J. Livak ,
L. W. Hobbs  and
D. L. Rohr
F. W. Clinard Jr.
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory Los Alamos, NM 87545, USA
R. J. Livak
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory Los Alamos, NM 87545, USA
L. W. Hobbs
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory Los Alamos, NM 87545, USA
D. L. Rohr
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory Los Alamos, NM 87545, USA
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Abstract

238Pu-substituted zirconolite (CaPuTi2O7) was held at ≈350 K for a time sufficient to allow self-irradiation damage to convert the material to the metamict condition. Samples were then stored at 875 K, while dimensional and microstructural changes were monitored by dilatometry and transmission electron microscopy. Densification proceeded sporadically over a period of ≈400 days, attaining a final value of 4 vol% as a result of crystallization. The material was found to be friable at an intermediate stage of recovery, apparently as a result of internal strains. Evidence is presented that CaPuTi2O7 can exist in more than one metamict state, depending on extent of prior damage and thermal history.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 50: Symposium STOCKHOLM – Scientific Basis for Nuclear Waste Management IX , 1985 , 371
Copyright
Copyright © Materials Research Society 1985

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