Solid state chalcophosphate compounds of actinide elements

Briggs Piccoii, Paula M.; Hess, Ryan F.; Dorhout, Peter K.; Briggs Piccoli, Paula M.; Abney, Kent D.; Schoonover, Jon R.
July 2000
AIP Conference Proceedings;2000, Vol. 532 Issue 1, p384
Academic Journal
This work involves the exploration of ternary and quaternary compounds of the actinide chalcogenides using a Zintl ion building block approach. Zintl ions are closed shell, main-group ions that can coordinate to other elements in the compound in such a way that builds up the structure. A common Zintl ion in the chalcophosphate family is the ethane-like (P[sub 2]Se[sub 6])[sup 4-] anion, which has been found to bond to main group, transition metal and lanthanide elements in a variety of coordination modes. To achieve our goal of new actinide-metal Zintl phase material synthesis, we are employing a low-to-moderate temperature (300 °C–800 °C) molten salt technique. This technique utilizes low-melting binary alkali chalcogen salts like K[sub 2]Se[sub 3] in combination with excess chalcogen as the oxidizing agent for the actinide metal and other main group elements to be incorporated into the final structure. This departure from conventional (high-temperature) routes to solid-state materials allows for formation and isolation of metastable phases with complex, low-dimensional structures not seen in the binary compounds. Prior to our studies, three quaternary compounds of actinide chalcophosphates were reported in the literature: K[sub 2]UP[sub 3]Se[sub 9], Rb[sub 4]U[sub 4]P[sub 4]Se[sub 26] and KTh[sub 2]Sb[sub 2]Se[sub 6]. The known ternary and quaternary chalcogen compounds of the actinides have thus far exhibited rich structural chemistry. © 2000 American Institute of Physics.


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