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- W2522996839 abstract "The use of molten boric acid as a reactiveflux for synthesizing actinide borates has been developed in thepast three years providing access to a remarkable array of exoticmaterials with both unusual structures and unprecedentedproperties. [ThB5O6(OH)6][BO(OH)2]“¢2.5H2O (NDTB-1) possesses acationic supertetrahedral structure and displays remarkable anionexchange properties with high selectivity for TcO4−. In addition,NDTB-1 was determined to show real utilities to solve theTechnetium Problem. Uranyl borates form noncentrosymmetricstructures with extraordinarily rich topological relationships.Neptunium borates are often mixed-valent and yield rare examples ofcompounds with one metal in three different oxidation states.Plutonium borates display new coordination chemistry for trivalentactinides. Finally, americium and curium borates show dramaticdepartures from plutonium borates, and form the first trivalentactinide compounds that do not have lanthanide analogues. There arescant examples of families of actinides compounds that extend pastplutonium to examine the bonding of later actinides. There areseveral grand challenges that this work addresses. The foremost ofthese challenges is the development of structure-propertyrelationships in transuranium materials. A deep understanding ofthe materials chemistry of actinides will likely lead to thedevelopment of advanced waste forms for radionuclides present innuclear waste that prevent their transport in the environment. Thiswork may have also uncovered the solubility-limiting phases ofactinides in some repositories such as the Waste Isolation PilotPlant (WIPP), and allows for measurements on the stability of thesematerials. The core of the this dissertation is focused on thecrystal chemistry and the structure-property relationship ofactinide borates that derived from the molten boric acid fluxreactions including thorium borate (Chapter 3), uranium borates(Chapter 4-7,12,14), neptunium borates (Chapter 9-14), plutoniumborates (Chapter 9,12,16,17), americium borate (Chapter 17), andcurium borate (chapter 18). During the course of these studies,several important side results were also serendipitouslydiscovered. These includes the anion exchange studies of NDTB-1(Chapter 3), studies of iodine incorporation into uranyl borates(Chapter 8), the discovery of new cation-cation interaction bondingmode for Np(V) (Chapter 15), and investigations of novelinterstitial incorporation of actinides into natural materials(Chapter 19)." @default.
- W2522996839 created "2016-09-30" @default.
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- W2522996839 date "2012-01-27" @default.
- W2522996839 modified "2023-09-24" @default.
- W2522996839 title "New Insights in Actinide Borate Chemistry" @default.
- W2522996839 hasPublicationYear "2012" @default.
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