Abstract
Silicates containing binary combinations of Cs cations with Mg, Sr, Cu, or Fe cations or a ternary combination of Cs, Cu, and Fe cations were prepared by the sol-gel procedure followed by heat treatment of the dried gels. Silicates of the composition Cs2MgSi5O12, Cs2SrSi5O12, Cs2CuSi5O12, CsFeSi2O6, and Cs2CuSi5O12·CsFeSi2O6 (Cs3CuFeSi7O18), according to the results of X-ray phase analysis, belong to the leucite family, space group Ia3d. The temperature range of their formation is 370–450°C (data of differential scanning calorimetry and X-ray phase analysis). The silicates underwent no chemical or phase transformations on heating to 900–1000°C. No egress of Cs from the silicates to the gas phase was observed on heating for 4–6 h at 800°C. The leaching rates of Cs and Sr at 25°C on the seventh day reached 10−7 g cm−2 day−1 (powdered samples, steady-state mode). The X-ray diffraction patterns of the silicates before and after hydrolytic tests were essentially similar.
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Original Russian Text © E.E. Loginova, A.I. Orlova, O.V. Shmidt, V.T. Demarin, Yu.I. Korneiko, 2010, published in Radiokhimiya, 2010, Vol. 52, No. 4, pp. 368–372.
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Loginova, E.E., Orlova, A.I., Shmidt, O.V. et al. Silicates of leucite structure as environmentally safe forms of cesium and strontium immobilization. Radiochemistry 52, 435–440 (2010). https://doi.org/10.1134/S1066362210040193
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DOI: https://doi.org/10.1134/S1066362210040193