The fluorides of the early actinide series are notable for their importance in processing of materials for sensitive nuclear capabilities, as well as potential use in molten salt reactors. Much recent work has been focused on ternary and quaternary uranium fluorides, but there is necessarily an expansion of these methods to the following elements. Although there are nearly two hundred uranium fluoride structures in the ICSD, there are only eleven plutonium fluoride structures published in a similar manner, none of which is newer than 1954. Neptunium is also somewhat neglected, and there is little in the way of high-quality structural data for fluorides of this nature. Several new structures of early actinide ammonium and alkali fluorides are presented, as well as reevaluation of previously-published structures with higher quality data. A discussion of the nature of the actinide-fluoride bond is also presented, with implications for theoretical treatment of highly ionic 5<i>f</i> interactions.

Characterization of several new ternary actinide fluorides

2019 Spring National Meeting

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