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Title: Influence of Self Damage on Pu(Am) observed through magnetization measurements

Abstract

No abstract prepared.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
908898
Report Number(s):
UCRL-CONF-229633
TRN: US0703792
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Presented at: The International Conference on Strongly Correlated Electron Systems, Houston, TX, United States, May 13 - May 18, 2007
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ELECTRONS; MAGNETIZATION; DAMAGE

Citation Formats

McCall, S K, Sykora, R E, Fluss, M J, Chung, B W, Chapline, G F, and Haire, R G. Influence of Self Damage on Pu(Am) observed through magnetization measurements. United States: N. p., 2007. Web.
McCall, S K, Sykora, R E, Fluss, M J, Chung, B W, Chapline, G F, & Haire, R G. Influence of Self Damage on Pu(Am) observed through magnetization measurements. United States.
McCall, S K, Sykora, R E, Fluss, M J, Chung, B W, Chapline, G F, and Haire, R G. Mon . "Influence of Self Damage on Pu(Am) observed through magnetization measurements". United States. doi:. https://www.osti.gov/servlets/purl/908898.
@article{osti_908898,
title = {Influence of Self Damage on Pu(Am) observed through magnetization measurements},
author = {McCall, S K and Sykora, R E and Fluss, M J and Chung, B W and Chapline, G F and Haire, R G},
abstractNote = {No abstract prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Apr 02 00:00:00 EDT 2007},
month = {Mon Apr 02 00:00:00 EDT 2007}
}

Conference:
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  • Results of radiation damage in Pu and Pu{sub 1-x}Am{sub x} alloys studied with magnetic susceptibility, {chi}(T), and resistivity are presented. Damage accumulated at low temperatures increases {chi}(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 {delta}-Pu specimen show that Stage I annealing, where interstitials begin to move, ismore » 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 Pu{sub 1-x}Am{sub x} 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 Pu{sub 1-x}Am{sub x} alloys.« less
  • Results of radiation damage in Pu and Pu{sub 1-x}Am{sub x} alloys studied with magnetic susceptibility, {chi}(T), and resistivity are presented. Damage accumulated at low temperatures increases {chi}(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 4.3 at% Ga stabilized {delta}-Pu specimen show that Stage I annealing, where interstitials begin to move,more » 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 Pu{sub 1-x}Am{sub x} 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 35 K. 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 Pu{sub 1-x}Am{sub x} alloys. (authors)« less
  • Discrepancies between the ion exchange or adsorption model predictions and laboratory model observations on the migration of Pu and Am in porous rocks are elucidated. While the simulation describes the major features well, it does not account for the asymmetric peak shape, etc. Results are explained as due to unsaturated flow. 8 figures. (DLC)
  • Pu(Am) is stable in the fcc {delta}-phase from a few atomic percent to nearly 80 atomic percent Am, expanding the average interatomic separation as the alloy concentration of Am increases. Both Pu and Am spontaneously decay by {alpha}-emission creating self-damage in the lattice in the form of vacancy-interstitial pairs and their aggregates. At sufficiently low temperatures, the damage is frozen in place, but can be removed by thermal annealing at sufficiently high temperatures, effectively resetting the system to an undamaged condition. The magnetic susceptibility and magnetization are observed to increase systematically as a function of accumulated damage in the fccmore » {delta}-Pu{sub 1-x}Am{sub x} (x=0.224). Some results of these observations are reported here.« less
  • Pu(Am) is stable in the fcc delta-phase from a few atomic percent to nearly 80 atomic percent Am, expanding the average interatomic separation as the alloy concentration of Am increases. Both Pu and Am spontaneously decay by alpha-emission creating self-damage in the lattice in the form of vacancy-interstitial pairs and their aggregates. At sufficiently low temperatures, the damage is frozen in place, but can be removed by thermal annealing at sufficiently high temperatures, effectively resetting the system to an undamaged condition. The magnetic susceptibility and magnetization are observed to increase systematically as a function of accumulated damage in the fccmore » delta-Pu{sub (1-x)}Am{sub (x)} (x=0.224). Some results of these observations are reported here. (authors)« less