New double sulfates of uranyl

The possibility has been established of the formation of double uranyl sulphates with the composition MUO2(SO4)2x5H2O (M=Mn or Co). These compounds are formed upon dissolution of MnSO4x5H2O or CoSO4x7H2O and UO2SO4x2.5H2O in a minimum amount of water with subsequent evaporation to dryness. The obtained monocrystals have been studied by X-ray structural analysis and the parameters of monoclinic elementary cells have been determined: MnUO2(SO4)2x5H2O (a=6.524; b=11.396; c=8.362 A; β=90 deg 47') and CoUO2(SO4)2x5H2O (a=6.448; b=11.305; c=8.286 A; β=90 deg). Possible spatial groups are P 2sub(1/m) or P21; Z=2. Thermographic study of the obtained compounds has been performed