Some preliminary results on deffects in irradiates UO2 single crystals as releaved by transmission electron microscopy

H. Blank, Severin Amelinckx

    Research outputpeer-review


    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.
    Original languageEnglish
    PublisherSCK CEN
    Number of pages15
    StatePublished - Jan 1963

    Publication series

    NameSCK CEN Reports
    PublisherSCK CEN

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