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Structural and spectroscopic investigations on the crystallization of uranium brannerite phases in glass
Author(s) -
Zhang Yingjie,
Karatchevtseva Inna,
Kong Linggen,
Wei Tao,
Zhang Zhaoming
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15750
Subject(s) - raman spectroscopy , actinide , europium , crystallization , uranium , materials science , cerium , spectroscopy , energy dispersive x ray spectroscopy , analytical chemistry (journal) , xanes , mineralogy , scanning electron microscope , nuclear chemistry , chemical engineering , chemistry , metallurgy , luminescence , composite material , physics , optoelectronics , chromatography , quantum mechanics , optics , engineering
Brannerite‐based glass‐ceramics with relatively high actinide waste loadings are potential waste forms for the immobilization of actinide‐rich radioactive wastes containing process chemicals. In this work, the crystallization of pentavalent uranium brannerite phases in glass with the incorporation of yttrium/cerium/europium has been investigated. The formation of brannerite phases in glass has been confirmed with X‐ray diffraction and Raman spectroscopy. The evolution of microstructures and the development of micro pores in brannerite phases have been revealed by scanning electron microscopy with the nominal formula, Y 0.51 U 0.49 Ti 2 O 6 , Ce 0.65 U 0.35 Ti 2 O 6 , and Eu 0.53 U 0.47 Ti 2 O 6 , being determined with energy‐dispersive spectroscopy. The presence of dominant U 5+ species has been proven with both diffuse reflectance spectroscopy and X‐ray absorption near‐edge spectroscopy. In addition, the systematic Raman band shifts with the mean cation radius in the studied brannerite series have been observed and discussed.