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<p>Zirconolite (CaZrTi<sub>2</sub>O<sub>7</sub>) is the best suited material for radioactive waste immobilization and management. Its synthesis is a&#xa0;cost- and time-demanding process. In this work, a&#xa0;ceramic material, primarily containing the zirconolite phase, is for the first time synthesized within a&#xa0;few seconds. Its synthesis is performed in air by heating a&#xa0;mixture of CaTiO<sub>3</sub>, ZrO<sub>2</sub> and TiO<sub>2</sub> powders using a&#xa0;high-power, fast-electron beam. The irradiation regimes are used, during which all of the mixture components melt, resulting in a&#xa0;liquid-phase, high-rate synthesis of a&#xa0;new ceramic material. The zirconolite phase accounts for more than 80% of the synthesized ceramics and exhibits low porosity. It is shown that a&#xa0;thermal annealing treatment of the resulting ceramic product in a&#xa0;high-power, fast-electron beam allows considerably increasing the zirconolite phase content in it.</p>

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Electron beam synthesis of CaZrTi2O7 zirconolite ceramics

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • S. A. Ghyngazov,
  • I. P. Vasil’ev,
  • V. A. Boltueva,
  • V. A. Vlasov

摘要

Zirconolite (CaZrTi2O7) is the best suited material for radioactive waste immobilization and management. Its synthesis is a cost- and time-demanding process. In this work, a ceramic material, primarily containing the zirconolite phase, is for the first time synthesized within a few seconds. Its synthesis is performed in air by heating a mixture of CaTiO3, ZrO2 and TiO2 powders using a high-power, fast-electron beam. The irradiation regimes are used, during which all of the mixture components melt, resulting in a liquid-phase, high-rate synthesis of a new ceramic material. The zirconolite phase accounts for more than 80% of the synthesized ceramics and exhibits low porosity. It is shown that a thermal annealing treatment of the resulting ceramic product in a high-power, fast-electron beam allows considerably increasing the zirconolite phase content in it.