Cesium incorporation in hollandite-rich multiphasic ceramic waste forms

Journal Article · Wed Feb 15 04:00:00 EST 2017 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2016.11.007· OSTI ID:22658172

Tumurugoti, P.; Clark, B. M. ^[1]; Edwards, D. J. ^[2]; Amoroso, Jake ^[3]; Sundaram, S. K. ^[1]

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1. Kazuo Inamori School of Engineering, The New York State College of Ceramics, Alfred University, Alfred, NY 14802 (United States)
2. Pacific Northwest National Laboratory, Richland, WA 99352 (United States)
3. Savannah River National Laboratory, Aiken, SC 29808 (United States)

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.

• OSTI ID: 22658172
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Vol. 246; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
BACKSCATTERING
ELECTRON DIFFRACTION
EXPERIMENTAL DATA
HOLLANDITE
IONS
WASTE FORMS
X-RAY DIFFRACTION