The paper presents the results of the studies of borophosphate glasses containing an additive of the FLiNaK salt, an eutectic mixture of alkali metal fluorides of the composition 46.5 mol. % LiF – 11.5 mol. % NaF–42 mol. % KF, as one of the types of radioactive waste from the developed molten salt nuclear reactors. The obtained glasses demonstrate a high percentage of FLiNaK inclusion, reaching 20…25 wt. %, and retain a homogeneous amorphous structure with a uniform distribution of elements throughout the volume. Starting with a FLiNaK content of 25 wt. %, the glasses crystallize with the formation of the elpasolite phase K2NaAlF6. According to X-ray diffraction studies, depending on the fluoride content in the glass, certain regularities were found indicating the presence of a correlation between the transformation of the local structure of the glass and the formation of the crystalline phase, which will be further studied in more detail. Studies of the chemical and mechanical stability of the obtained glasses with a FLiNaK content of no more than 20 wt. % indicate that these glasses meet the regulatory requirements for glass matrices used to immobilize radioactive waste. At the same time, the dependence of these properties on the FLiNaK content revealed the presence of an extremum at a value of 7 wt. % FLiNaK, but no correlations with structural changes were detected.
Maxim I. Vlasov – PhD (Physical and Mathematical Sciences), head of the Laboratory for High-Temperature Electrochemistry of Actinides and Rare-Earth Metals, Institute of High-Temperature Electrochemistry of the Ural Branch of the Russian Academy of Sciences, Yekaterinburg, Russia
Elizaveta D. Vedernikova – master's student, engineer of the Laboratory of High-Temperature Electrochemistry of Actinides and Rare Earth Metals, Institute of High-Temperature Electrochemistry of the Ural Branch of the Russian Academy of Sciences, Yekaterinburg, Russia
Vadim M. Gadelshin – senior lecturer, Chair for Technical Physics, Physical and Technical Institute, Ural Federal University, Yekaterinburg, Russia
Maxim A. Kovalenko – PhD (Physical and Mathematical Sciences), Assistant Professor, Chair for Technical Physics, Physical and Technical Institute, Ural Federal University, Yekaterinburg, Russia
Dmitry Yu. Suntsov – head of Department, Joint-Stock Company “Advanced Research Institute of Inorganic Materials named after Academician A. A. Bochvar”, Moscow, Russia
Aleksandra I. Tuchkova – major specialist, Joint-Stock Company “Advanced Research Institute of Inorganic Materials named after Academician A. A. Bochvar”, Moscow, Russia
Alina A. Lavrentyeva – industrial engineer of 2nd category, Joint-Stock Company “Advanced Research Institute of Inorganic Materials named after Academician A. A. Bochvar”, Moscow, Russia
Diana S. Shtivel – industrial engineer of 2nd category, Joint-Stock Company “Advanced Research Institute of Inorganic Materials named after Academician A. A. Bochvar”, Moscow, Russia
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