Synthesis of Perovskite by Double-SHS for Immobilization of ⁹⁰Sr

Perovskite synroc samples containing high level radioactive waste （HLW)⁹⁰Sr were synthesized by double selfpropagating hightemperature synthesis (SHS) and their properties, including leach rate, density, microhardness and the maximum content of high level radioactive waste in the samples, were tested by X-ray diffraction， scanning electron microscope and PCT powder immersion analysis. The results indicate that the high density Sr2+-CaTiO₃ composite are formed， and leaching rates are less than 0.1 g/(m²•d), and the maximum SrO content in the composite can reach 36% in mass. It can be concluded that the perovskite synroc is a perfect material to immobilize HLW.