Cesium incorporation in hollandite-rich multiphasic ceramic waste forms

被引：23
|
作者：
Tumurugoti, P. [1 ]
Clark, B. M. [1 ]
Edwards, D. J. [2 ]
Amoroso, Jake [3 ]
Sundaram, S. K. [1 ]
机构：
[1] Alfred Univ, New York State Coll Ceram, Kazuo Inamori Sch Engn, Alfred, NY 14802 USA
[2] Pacific Northwest Natl Lab, Richland, WA 99352 USA
[3] Savannah River Natl Lab, Aiken, SC 29808 USA
来源：
JOURNAL OF SOLID STATE CHEMISTRY | 2017年 / 246卷
基金：
美国国家科学基金会;
关键词：
Ceramic waste forms; Hollandite; Melt-processing; SPS; Cs partitioning; Microstructure; SYNROC-TYPE HOLLANDITES; NUCLEAR-WASTE; STRUCTURAL-ANALYSIS; RADIOACTIVE CESIUM; BARIUM HOLLANDITE; IMMOBILIZATION; PHASE; CHEMISTRY; SUBSTITUTION; DIFFRACTION;
D O I：
10.1016/j.jssc.2016.11.007
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
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.
引用
收藏
页码：107 / 112
页数：6
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