Recent progress in actinide borate chemistry

Wang, S. A., Alekseev, E. V., Depmeier, W. and Albrecht-Schmitt, T. E. (2011) Recent progress in actinide borate chemistry Chemical Communications, 47 (39). pp. 10874-10885. DOI 10.1039/c1cc14023j.

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Abstract

The use of molten boric acid as a reactive flux for synthesizing actinide borates has been developed in the past two years providing access to a remarkable array of exotic materials with both unusual structures and unprecedented properties. [ThB(5)O(6)(OH)(6)][BO(OH)(2)]center dot 2.5H(2)O possesses a cationic supertetrahedral structure and displays remarkable anion exchange properties with high selectivity for TcO(4)(-). Uranyl borates form noncentrosymmetric structures with extraordinarily rich topological relationships. Neptunium borates are often mixed-valent and yield rare examples of compounds with one metal in three different oxidation states. Plutonium borates display new coordination chemistry for trivalent actinides. Finally, americium borates show a dramatic departure from plutonium borates, and there are scant examples of families of actinides compounds that extend past plutonium to examine the bonding of later actinides. There are several grand challenges that this work addresses. The foremost of these challenges is the development of structure-property relationships in transuranium materials. A deep understanding of the materials chemistry of actinides will likely lead to the development of advanced waste forms for radionuclides present in nuclear waste that prevent their transport in the environment. This work may have also uncovered the solubility-limiting phases of actinides in some repositories, and allows for measurements on the stability of these materials.

Document Type: Article
Keywords: bond-valence parameters crystal-structure nuclear-waste polyhedron geometries cationic framework hellandite-group thorium borate neptunium uranium plutonium
Research affiliation: Kiel University
DOI etc.: 10.1039/c1cc14023j
ISSN: 1359-7345
Date Deposited: 15 Dec 2011 05:29
Last Modified: 08 Oct 2012 09:27
URI: http://eprints.uni-kiel.de/id/eprint/15661

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