Electron irradiation effects in (Cs,Ba)-hollandites

High-resolution electron microscopy examination of mixed (Cs,Ba)-hollandites reveals evidence for significant short-range order in the distribution of cation vacancies in the incompletely occupied tunnels. The structure was observed to be quite unstable under 400-keV electron irradiation after only...

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Bibliographic Details
Published in:Journal of solid state chemistry 1987-08, Vol.69 (2), p.343-354
Main Authors: Bursill, L.A., Smith, David J.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Electrons and positron radiation effects
Exact sciences and technology
Physical radiation effects, radiation damage
Physics
Structure of solids and liquids
crystallography
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Summary:High-resolution electron microscopy examination of mixed (Cs,Ba)-hollandites reveals evidence for significant short-range order in the distribution of cation vacancies in the incompletely occupied tunnels. The structure was observed to be quite unstable under 400-keV electron irradiation after only a few minutes' study at a dose rate of ca. 10 4 electrons Å −2 sec −1. Transformations to a microtwinned phase having interaxial angles of 80°/110° rather than 90°, and finally to an amorphous substance, were directly observed and recorded using video techniques. It is evident that hollandites are structurally, chemically, and mechanically unstable under intense electron irradiation. The significance of these observations to the possible effects of self-irradiation in SYNROC preparations, where radioactive 137Cs +1 transmites to 137Ba 2+ by electron decay, is discussed.
ISSN:0022-4596
1095-726X
DOI:10.1016/0022-4596(87)90092-2