Cesium incorporation in hollandite-rich multiphasic ceramic waste forms

Hollandite-rich multiphase waste form compositions processed by melt-solidification and spark plasma sintering (SPS) were characterized, compared, and validated for nuclear waste incorporation. Phase identification by x-ray diffraction (XRD) and electron back-scattered diffraction (EBSD) confirmed h...

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Bibliographic Details
Published inJournal of solid state chemistry Vol. 246
Main Authors Tumurugoti, P., Clark, B.M., Edwards, D.J., Amoroso, Jake, Sundaram, S.K.
Format Journal Article
LanguageEnglish
Published United States 15.02.2017
Subjects
BACKSCATTERING
ELECTRON DIFFRACTION
EXPERIMENTAL DATA
HOLLANDITE
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
IONS
WASTE FORMS
X-RAY DIFFRACTION
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Summary:Hollandite-rich multiphase waste form compositions processed by melt-solidification and spark plasma sintering (SPS) were characterized, compared, and validated for nuclear waste incorporation. Phase identification by x-ray diffraction (XRD) and electron back-scattered diffraction (EBSD) confirmed hollandite as the major phase present in these samples along with perovskite, pyrochlore and zirconolite. Distribution of selected elements observed by wavelength dispersive spectroscopy (WDS) maps indicated that Cs formed a secondary phase during SPS processing, which was considered undesirable. On the other hand, Cs partitioned into the hollandite phase in melt-processed samples. Further analysis of hollandite structure in melt-processed composition by selected area electron diffraction (SAED) revealed ordered arrangement of tunnel ions (Ba/Cs) and vacancies, suggesting efficient Cs incorporation into the lattice.
ISSN:0022-4596
1095-726X
DOI:10.1016/J.JSSC.2016.11.007