Hot isostatic pressed pyrochlore glass‐ceramics: revealing structure insides at the reaction interface
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Date
2021-06-15
Authors
Zhang, YJ
Wei, T
Xu, A
Dayal, P
Gregg, DJ
Journal Title
Journal ISSN
Volume Title
Publisher
Wiley
Abstract
As potential waste forms for immobilizing actinide‐rich radioactive wastes, Eu2Ti2O7 (Eu as a surrogate for minor actinides) pyrochlore glass‐ceramics were fabricated via hot isostatic pressing (HIPing) at 1200°C. The structure and microstructure at the reaction interface between the glass‐ceramic waste form and the stainless steel (SS) canister under HIPing conditions were carefully investigated with scanning electron microscopy (SEM), transmission electron microscopy (TEM), and synchrotron single crystal X‐ray diffraction (SC‐XRD). The interactions at the reaction interface led to the formations of a ~10‐µm‐thick Cr2O3 layer as the oxidation front of the SS and a layer of a mixed oxide phase (Eu1.25SiCr0.8Ti1.2O7.5) on the glass‐ceramic side of the reaction interface. The crystal structure of such a unique mixed oxide phase was revealed indubitably with a combination of synchrotron SC‐XRD and TEM assisted with a focused ion beam (FIB) SEM system. The improved structural understanding of the reaction interface will help to support the utilization of HIPing as a versatile hot consolidation process for the treatment of radioactive wastes. © 2024 The American Ceramic Society/
Description
Keywords
Pyrochlore, Ceramics, Actinides, Radioactive wastes, Microstructure, Microscopy, Europium, Silicon, Chromium, Crystal structure, Oxides, Synroc process, Glass, Transmission electron microscopy
Citation
Zhang, Y., Wei, T., Xu, A., Dayal, P., & Gregg, D. J. (2021). Hot isostatic pressed pyrochlore glass-ceramics: revealing structure insides at the reaction interface. Journal of the American Ceramic Society, 104(11), 5981-5989. doi:10.1111/jace.17958