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Influence of Radiation Damage and Isochronal Annealing on the Magnetic Susceptibility of Pu1-xAmx Alloys

Published online by Cambridge University Press:  01 February 2011

Scott K McCall ,
Michael J Fluss ,
Brandon W. Chung  and
Richard G. Haire
Scott K McCall
Affiliation:
[email protected], LLNL, ., ., Livermore, CA, 94550, United States, 925-422-1499
Michael J Fluss
Affiliation:
[email protected], LLNL, CMELS, 7000 East Ave, Livermore, CA, 94550, United States
Brandon W. Chung
Affiliation:
[email protected], LLNL, CMELS, 7000 East Ave, Livermore, CA, 94550, United States
Richard G. Haire
Affiliation:
[email protected], ORNL, Oak Ridge, TN, 37830, United States
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Abstract

Results of radiation damage in Pu and Pu1-xAmx alloys studied with magnetic susceptibility, χ(T), and resistivity are presented. Damage accumulated at low temperatures increases χ(T) for all measured alloys, with the trend generally enhanced as the lattice expands. There is a trend towards saturation observable in the damage induced magnetic susceptibility data. that is not evident in similar damage induced resistivity data taken on the same specimen. A comparison of isochronal annealing curves measured by both resistivity and magnetic susceptibility on a 4.3at% Ga stabilized δ-Pu specimen show that Stage I annealing, where interstitials begin to move, is largely transparent to the magnetic measurement. This indicates that interstitials have little impact on the damage induced increase in the magnetic susceptibility. The isochronal annealing curves of the Pu1-xAmx alloys do not show distinct annealing stages as expected for alloys. However, samples near 20% Am concentration show an unexpected increase in magnetization beginning when specimens are annealed to 35K. This behavior is also reflected in a time dependent increase in the magnetic susceptibility of damaged specimens indicative of first order kinetics. These results suggest there may be a metastable phase induced by radiation damage and annealing in Pu1-xAmx alloys.

Keywords

Puradiation effectsannealing
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1104: Symposium NN – Actinides 2008—Basic Science, Applications and Technology , 2008 , 1104-NN01-05
Copyright
Copyright © Materials Research Society 2008

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