K. Małetka1, A. Murasik1, W. Szczepaniak2
1 Institute of Atomic Energy, Świerk, 05-400 Otwock, Poland,
2 Institute of Inorganic Chemistry and Metallurgy of Rare Elements, Technical University of Wroclaw,
Wybrzeże Wyspianskiego 27, 50-370 Wrocław, Poland
Na2Ul6 and other alkali metal hexahalideuranates have been reported to be the
fast-ion conductors. While the structure of Na2UBr6, Na2UCl6
and Li2UCl6, studied extensively by neutron diffraction, shows a close similarity,
the crystal structure of sodium hexaiodouranate was found to be different. The question arises how this
fact may influence the mechanism of ionic conductivity. Several aspects of this problem are discussed
and proposals for the future neutron experiments are outlined.