CESIUM AND STRONTIUM IMMOBILIZATION INTO THE HOLLANDITE MATRICES: SYNTHESIS, PHASE FORMATION, ISOMORPHIC CAPACITY
Abstract
The possibility for isomorphic replacement of the Ba2+ ions in the BaFe2Ti6O16 ferruginous hollandite structure with Sr2+ and Cs+ ions — radioactive waste potential components has been demonstrated. Thermal stability areas of hollandite structure and boundaries of isomorphic mixing as strontium and cesium in place of barium are determined. Kinetics of solid solution making process based on hollandite from the mixture of coprecipitated hydroxocarbonates is investigated. It is established that crystallization of hollandite phases is not followed by crystallization of intermediate compounds and takes place at significantly lower temperatures and time of standing than from the mixture of initial oxides.
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