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Title: Some Preliminary Results on Defects in Irradiated UO2 Single Crystals as Revealed by Transmission Electron Microscopy

Abstract

Vapor-grown single crystals of nearly stoichiometric UO2 have been thinned for transmission electron microscopy. The as-grown crystals show a dense pattern of precipitates and may contain loops due to quenched-in vacancies but contain hardly any dislocations. Two models for the production of loops are proposed. Dislocation networks (small angle boundaries) are produced on annealing the crystals. Irregular patterns of dislocations arise when sufficient thick parts of the crystal foils are treated with heat shocks in the microscope suddenly increasing the beam current. After exposure to 1015 nvt the crystal foils show fission tracks, short segments of straight dislocation lines, and black dots, which are partly distributed at random and partly are aligned on fission tracks. Interaction between fission tracks and dislocations has been observed. The conditions for contrast production on fission tracks have been investigated. The experimental findings can be explained by a model of a displacement field around the fission tracks.

Authors:
;
Publication Date:
Research Org.:
SCK-CEN, Mol, Belg.
Sponsoring Org.:
USDOE
OSTI Identifier:
4119509
NSA Number:
NSA-18-005824
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 34; Journal Issue: 8; Other Information: EUR 452.e. Orig. Receipt Date: 31-DEC-64; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
Country unknown/Code not available
Language:
English
Subject:
METALS, CERAMICS, AND OTHER MATERIALS; ANNEALING; DEFECTS; DISLOCATIONS; ELECTRON BEAMS; ELECTRON MICROSCOPY; FOILS; IRRADIATION; MONOCRYSTALS; PARTICLE TRACKS; PRECIPITATION; RADIATION DOSES; RADIATION EFFECTS; THICKNESS; URANIUM DIOXIDE; VACANCIES

Citation Formats

Blank, H., and Amelinckx, S. Some Preliminary Results on Defects in Irradiated UO2 Single Crystals as Revealed by Transmission Electron Microscopy. Country unknown/Code not available: N. p., 1963. Web. doi:10.1063/1.1702714.
Blank, H., & Amelinckx, S. Some Preliminary Results on Defects in Irradiated UO2 Single Crystals as Revealed by Transmission Electron Microscopy. Country unknown/Code not available. https://doi.org/10.1063/1.1702714
Blank, H., and Amelinckx, S. 1963. "Some Preliminary Results on Defects in Irradiated UO2 Single Crystals as Revealed by Transmission Electron Microscopy". Country unknown/Code not available. https://doi.org/10.1063/1.1702714.
@article{osti_4119509,
title = {Some Preliminary Results on Defects in Irradiated UO2 Single Crystals as Revealed by Transmission Electron Microscopy},
author = {Blank, H. and Amelinckx, S.},
abstractNote = {Vapor-grown single crystals of nearly stoichiometric UO2 have been thinned for transmission electron microscopy. The as-grown crystals show a dense pattern of precipitates and may contain loops due to quenched-in vacancies but contain hardly any dislocations. Two models for the production of loops are proposed. Dislocation networks (small angle boundaries) are produced on annealing the crystals. Irregular patterns of dislocations arise when sufficient thick parts of the crystal foils are treated with heat shocks in the microscope suddenly increasing the beam current. After exposure to 1015 nvt the crystal foils show fission tracks, short segments of straight dislocation lines, and black dots, which are partly distributed at random and partly are aligned on fission tracks. Interaction between fission tracks and dislocations has been observed. The conditions for contrast production on fission tracks have been investigated. The experimental findings can be explained by a model of a displacement field around the fission tracks.},
doi = {10.1063/1.1702714},
url = {https://www.osti.gov/biblio/4119509}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 8,
volume = 34,
place = {Country unknown/Code not available},
year = {Tue Jan 01 00:00:00 EST 1963},
month = {Tue Jan 01 00:00:00 EST 1963}
}