Electron Backscattered Diffraction in the Study of Matrices for High-Level Wastes

The possibilities of scanning electron microscopy and electron backscatter diffraction (EBSD) in the study of matrices for immobilization of high-level radioactive wastes are shown from the example of two samples with Th (a Pu imitator) and Nd (an imitator of the REE–actinide fraction). The samples...

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Bibliographic Details
Published in:Doklady earth sciences 2022-12, Vol.507 (2), p.1148-1153
Main Authors: Yudintsev, S. V., Nickolsky, M. S., Stefanovskaya, O. I., Nikonov, B. S., Ulanova, A. S.
Format: Article
Language:English
Subjects:
Backscatter
Crystallization
Diffraction
Earth and Environmental Science
Earth Sciences
Electron backscatter diffraction
Electron microscopy
Geoecology
Glassy carbon
High level radioactive wastes
Immobilization
Nuclear energy
Nuclear fuel cycle
Polytypes
Radioactive wastes
Rutile
Scanning electron microscopy
Thorium
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Summary:The possibilities of scanning electron microscopy and electron backscatter diffraction (EBSD) in the study of matrices for immobilization of high-level radioactive wastes are shown from the example of two samples with Th (a Pu imitator) and Nd (an imitator of the REE–actinide fraction). The samples were produced by melting-crystallization and are composed of murataite and zirconolite (sample with Th) or pyrochlore, zirconolite, and rutile (sample with Nd). Murataite is a polysome 8C, and zirconolite includes polytypes 3T (sample with Th) or 4M (sample with Nd). The formation of zirconolite in a sample with Nd is probably caused by partial reduction of Ti 4+ up to Ti 3+ upon the reaction of melt with a glassy carbon crucible. It is concluded with the efficiency of EBSD in a study of crystalline matrices for radioactive wastes.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X22600827