Reinvestigation of the crystal structure of CaCe(SiO)O apatite by Rietveld refinement.

Ca(SiO)O apatites with = La, Ce, Pr, Nd, Sm, Eu, Gd and Tb crystallize in space group 6/. The crystal structure of apatite-type CaCe(SiO)O [dicalcium octa-cerium hexa-kis-(silicate) dioxide], which has been synthesized by calcination, was refined from powder X-ray diffraction data using the Rietveld method. A database survey shows that contrary to the previously published CaCe(SiO)O structure [Skakle (2000 ▸).

Immobilization of radioactive iodine in silver aluminophosphate glasses.

Silver aluminophosphate glasses have been investigated as matrices for the immobilization of radioactive iodine. In this study, up to 28mol% AgI have been incorporated without volatilization thanks to a low temperature synthesis protocol. Alumina was added in the composition in order to increase the glass transition temperature for a better thermal stability in a repository conditions.