Abstract
Ceramic materials based on garnet, (Y,Gd,An,...)3(Al,Ga,An,...)5O12 and perovskite (Y,Gd,An,...)(Al,Ga,An,...)O3 structures have been proposed for the immobilization of weapons-grade actinide-containing waste materials with complex chemical compositions. Cathodoluminescence (CL) images and emission spectra of synthetic garnet and perovskite crystals containing Ce, U and Pu were studied. It was determined that Pu3+ incorporated into the garnet matrix has characteristic CL emission bands at 1.9 and 1.6 eV. The loading capacity of the garnet lattice for Pu4+ incorporation is significantly higher than for Pu3+ and similar to U4+. The maximum amount of Pu3+ that may be incorporated into the garnet structure experimentally is 0.3 wt.% in comparison with 5.3 wt.% for Pu4+. The CL emission spectra of Ce3+ in different materials is a characteristic property and can be used for identification of garnet and perovskite phases into the multiphase ceramic matrices simultaneously with microprobe analysis
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