Synthesis and properties of uranosilicates M[HSiUO6]•nH2O (M=NH4+, Li, Na, K, Rb, Cs)

A complete set of uranosilicates M[HSiUO6] . nH(2)O of alkali metals and ammonium was obtained under hydrothermal conditions. The functional and phase similarity of the compounds was proved by X-ray phase analysis and IR spectroscopy. The effect of water molecules on the structures of hydrated and anhydrous uranosilicates and the nature of water in these compounds were elucidated by studying hydration-dehydration processes. The dependence of the X-ray and thermal properties of the compounds on the nature of interlayer atoms was considered.