Abstract
A new group of UO 2SO 4-based compounds, viz (Na 2XO 4) n UO 2SO 4 where X=S, Mo, W and n = 1, 1.5, 2 has been prepared in both the glass and crystalline states. These compounds exhibit fast Na + ion conductivity or solid electrolyte properties. The glassy Na 2SO 4 member, Na 4UO 2(SO 4) 3 represents one of the few sulfate glasses in contrast to the usual oxide glasses. The isothermal ionic conductivity is ∼ 100 times higher in the glass relative to its crystal analog where the glass molar volume is ∼ 7% larger. The higher conductivity with larger “free” volume relationship suggests a percolation-type transport mechanism. Na 4UO 2(SO 4) 3 undergoes unusual phase transition, i.e. glass→stable intermediate→crystal, as shown by conductivity-temperature plots and DSC traces.
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