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Abstract <p>The phase formation of the phosphates Tc<sub>0.5</sub>Zr<sub>0.5</sub>P<sub>2</sub>O<sub>7</sub>, Tc<sub>0.25</sub>Zr<sub>0.75</sub>P<sub>2</sub>O<sub>7</sub>, and Tc<sub>0.25</sub>Np<sub>0.25</sub>Zr<sub>0.5</sub>P<sub>2</sub>O<sub>7</sub> for the immobilization of technetium and technetium–neptunium fractions was studied. The powders were obtained by precipitation from solution. The target phase formation temperature was 600°C. The compounds obtained are single-phase products and crystallize in the cubic system, space group <i>Pa</i>–3. The solidification of the real technetium–zirconium fraction from VVER-1000 SNF processing was performed. The hydrolytic durability of the samples was studied by long-term static leaching. The degrees of leaching were as follows: Tc, no more than 0.03%; Np, 0.008%; Zr, less than 0.001%.</p>

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Mineral-Like Consolidating Matrix Materials for Solidification of Technetium and Technetium–Neptunium Fractions

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • K. K. Korchenkin,
  • V. A. Orlova,
  • A. V. Gazdanova,
  • N. V. Lavina

摘要

Abstract

The phase formation of the phosphates Tc0.5Zr0.5P2O7, Tc0.25Zr0.75P2O7, and Tc0.25Np0.25Zr0.5P2O7 for the immobilization of technetium and technetium–neptunium fractions was studied. The powders were obtained by precipitation from solution. The target phase formation temperature was 600°C. The compounds obtained are single-phase products and crystallize in the cubic system, space group Pa–3. The solidification of the real technetium–zirconium fraction from VVER-1000 SNF processing was performed. The hydrolytic durability of the samples was studied by long-term static leaching. The degrees of leaching were as follows: Tc, no more than 0.03%; Np, 0.008%; Zr, less than 0.001%.