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Positron Lifetime Studies of Electron-Irradiated Copper / TD. Hadnagy, JG. Byrne, GR. Miller

Conference Author
Effects of Radiation on Materials (1980 : Savannah, Georgia)
Physical Description
1 online resource (13 pages) : illustrations, figures, tables
Additional Creators
Byrne, JG., Hadnagy, TD., Miller, GR., American Society for Testing and Materials, and ASTM International
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Summary
Single-crystal copper was irradiated at 80 K with 4.5 MeV electrons producing simple Frenkel defects as well as a significant concentration of multivacancies. Mean positron lifetime characteristics, which are sensitive to the presence of vacancies and multivacancies in copper, were monitored after isochronal anneals between 80 and 800 K. A study of the dependence of the mean positron lifetime on the total electron fluence was made and compared with existing theories relating these lifetimes to vacancy or multivacancy concentrations. Numerical data from curve-fitting procedures using a conventional trapping model for defect-induced changes in positron lifetimes indicate that about 8 percent of the defects produced by the irradiation were multivacancy units. Multivacancies appear to be about six times more effective in trapping positrons than are monovacancies. Further, the data suggest that Stage III annealing processes in electron-irradiated copper most probably involve the motion and removal of both monovacancies and divacancies. A conglomerate (multivacancy) unit appears to exist as a stable entity even after annealing procedures are carried out at temperatures slightly above the Stage III region. Such a stable unit could serve as a nucleation center for the appearance of voids.
Dates of Publication and/or Sequential Designation
Volume 1981, Issue 725 (January 1981)
Subject(s)
Other Subject(s)
ISBN
9780803147942 (e-ISBN)
9780803107557
0803107552
Digital File Characteristics
text file PDF
Bibliography Note
Includes bibliographical references 24.
Other Forms
Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription.
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Also available in PDF edition.
Reproduction Note
Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 1981. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
Technical Details
Mode of access: World Wide Web.
Source of Acquisition
ASTM International PDF Purchase price USD25.
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