Calcined simulated high level liquid waste (HLLW) with a desired amount of TiN and AlN mixture was heat-treated at 1673–1873 K. It was revealed that the mixture of TiN and AlN (the atomic ratio of Al to Ti is 1:9) caused the melting of the specimen at 1673 K and the separation of the elements into two groups: alloy phase and oxide phase. The analysis of the oxide phase showed that the compounds in it could be divided into four phases, and that all fission product elements formed the complex oxides with Ti and Al. It is considered that Al and Zr dissolution in each phase contribute to the melting of the oxide phase at 1673K. A 30-days Soxhlet leach test showed that the chemical durability of the oxide phase as a waste form was superior to that of glass waste form[l]
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Uno, M., Kinoshita, H. & Yamanaka, S. Melting Simulated High-Level Liquid Waste With Addition of TiN and AlN. MRS Online Proceedings Library 608, 449 (1999). https://doi.org/10.1557/PROC-608-449