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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on NaBiO3 by Materials Project

NaBiO3 is Ilmenite structured and crystallizes in the trigonal R-3 space group. The structure is three-dimensional. Na1+ is bonded to six equivalent O2- atoms to form distorted NaO6 octahedra that share corners with nine equivalent BiO6 octahedra, edges with three equivalent NaO6 octahedra, and a faceface with one BiO6 octahedra. The corner-sharing octahedra tilt angles range from 39–62°. There are three shorter (2.39 Å) and three longer (2.60 Å) Na–O bond lengths. Bi5+ is bonded to six equivalent O2- atoms to form BiO6 octahedra that share corners with nine equivalent NaO6 octahedra, edges with three equivalent BiO6 octahedra, and a faceface with one NaO6 octahedra. The corner-sharing octahedra tilt angles range from 39–62°. There are three shorter (2.14 Å) and three longer (2.18 Å) Bi–O bond lengths. O2- is bonded in a distorted see-saw-like geometry to two equivalent Na1+ and two equivalent Bi5+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2025

Adsorption and Chromatographic Behavior of Dispersed Sodium Bismuthate Systems for the Separation of Americium from Curium

The selective partitioning of americium (Am) and curium (Cm) is integral for nuclear science areas such as the nuclear fuel cycle, stockpile stewardship, and isotope production but remains a long-standing radioanalytical challenge due to nearly identical chemical properties. Differences in redox chemistry can be exploited since Am can be oxidized to the hexavalent oxidation state. Sodium bismuthate (NaBiO 3 ) exhibits favorable oxidation and ion exchange characteristics conducive to a rapid and efficient Am/Cm chromatographic separation. Contact of nitric acid with NaBiO 3 was shown to significantly decrease the nitric acid concentration and solution volume. The adsorption, kinetic, and chromatographic behavior of Am and Cm in systems that disperse NaBiO3 in filter aids was evaluated. Further, dispersion of NaBiO 3 increased separation factors to over 100, with rapid kinetics achieved within 1 min of contact and sustained for at least 2 h. The adsorption capacity was more than doubled from 0.066 mequiv g –1 for solid NaBiO 3 alone to 0.149(6) and 0.156(9) meq g –1 when dispersed in Celite 545 and silica gel, respectively. Complete separation was achieved in all systems with ~100% recovery in the respective eluted fractions.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗