Study on the interaction of package capacity simulated nuclide La and Ce in borosilicate glass and the chemical stability of solidified body

Abstract

In this paper, using borosilicate glass was used as the base glass, using La₂O₃,CeO₂ simulated trivalent and tetravalent lineage actinide nuclides, study the interaction between La₂O₃ and CeO₂ in borosilicate and the properties of the cured body, and obtain the borosilicate cured body sample by solid melting method. By XRD, SEM-EDS, FTIR test results showed that adding CeO₂ at the fixed La₂O₃ content will reduce the packing capacity of borosilicate glass to La₂O₃, but adding La₂O₃ at the fixed CeO₂ content will increase the packing capacity of borosilicate glass to CeO₂. Density tests showed that adding CeO₂ at the fixed La₂O₃ content will increase the cured body density and then decrease, but adding La₂O₃ at the fixed CeO₂ content will only increase the cured body density all the time.The results of 28 days of leaching experiments showed that the leaching rate of Ca and Si elements was kept at 10^–4 dot product in all samples, while the leaching rate of La and Ce elements remained at 10^–6 dot product or even lower, indicating the good chemical stability of the cured body.