X-ray diffractometric study of phase formation upon synthesis of actinoid matrices

The products of the synthesis of crystalline matrices, which are promising for the immobilization of actinides, have been studied by X-ray phase analysis. The experiments were carried out with compositions corresponding to the stoichiometry of the phases of zirconolite (CaZrTi ₂ O ₇ ) and pyrochlore (CaCeTi ₂ O ₇ , Gd ₂ Ti ₂ O ₇ , Gd ₂ Zr ₂ O ₇ ) structural types. The experiments were carried out in the temperature range 800 - 1600 ° C, sintering duration 5 - 50 h, in air and oxygen. The conditions for phase formation in matrices of various compositions have been determined. Practical recommendations are given. Tab. 5, bibliography: 11 titles.