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Author Faldowski, J. A. ♦ Motta, A. T. ♦ Howe, L. M. ♦ Okamoto, P. R.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ ZIRCONIUM ALLOYS ♦ PHYSICAL RADIATION EFFECTS ♦ CHROMIUM ALLOYS ♦ AMORPHOUS STATE ♦ ELECTRON BEAMS ♦ ENERGY DEPENDENCE ♦ KEV RANGE 100-1000 ♦ DEFECTS ♦ ATOMIC DISPLACEMENTS ♦ CROSS SECTIONS ♦ AMORPHIZATION ♦ DISPLACEMENTS
Abstract The influence of electron energy on the amorphization of ZrCr{sub 2} at 25 K was measured. Amorphization was observed at electron energies from 900 to 330 keV. The dose-to-amorphization increases with decreasing electron energy with two steps, one at 700 keV corresponding to the decrease in the Zr displacement cross section due to the approaching displacement threshold of Zr and one at 500 keV corresponding to an appreciable decrease in the displacement cross section of Cr due to the approaching displacement threshold for Cr. At lower electron energies, it is believed that amorphization occurs principally through a secondary displacement mechanism, where light impurity atoms (mainly O) are displaced by electrons and displace in turn the heavier atoms. By fitting the results using electron displacement cross sections, we find the displacement energies in each sublattice to be {ital E}{sub {ital d}}{sup Zr}=22 eV, {ital E}{sub {ital d}}{sup Cr}=23 eV, {ital E}{sub {ital d}}{sup O}=4 eV. {copyright} {ital 1996 American Institute of Physics.}
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-07-01
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 80
Issue Number 2


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