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<p>In this work the method of obtaining composite ceramics based on perovskite and pyrochlore of compositions Y<sub>x</sub>Zr<sub>x</sub>Sr<sub>1-3x</sub>TiO<sub>3</sub> (x = 0.1, x = 0.2, x = 0.3) and Y<sub>2</sub>(Zr<sub>x</sub>Ti)<sub>2</sub>O<sub>7</sub> (x = 1) using the technology of reactive spark plasma sintering has been investigated. A comprehensive study of phase transformations, structure formation and physical and mechanical characteristics of ceramics depending on the ratio of Sr<sup>2+</sup>/Y<sup>3+</sup>/Zr<sup>4+</sup> has been carried out by XRD, SEM, EDS and “diffraction movie” methods at the synchrotron radiation source. High hydrolytic stability of ceramics is proved and the mechanism of low leaching rate of Sr<sup>2+</sup> &lt; 10<sup>–7</sup>&#xa0;g&#xa0;cm<sup>−2</sup>&#xa0;day, Y<sup>3+</sup> and Zr<sup>4+</sup> &lt; 10<sup>–5</sup>&#xa0;g&#xa0;cm<sup>−2</sup>&#xa0;day is described, which corresponds to GOST R 50926-96 and ANSI/ANS 16.1. The results of the work are promising for conditioning of radioactive waste and production of radioisotope products.</p> Graphical Abstract <p></p>

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Sustainable synthesis of composite ceramics using in situ synchrotron X-ray diffraction for effective immobilization of Sr-90 and its fission products

  • 期刊论文

  • 发表日期：

    2024年12月31日

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  • E. K. Papynov,
  • A. A. Belov,
  • O. O. Shichalin,
  • A. P. Zavjalov,
  • I. Yu. Buravlev,
  • A. N. Drankov,
  • S. A. Azon,
  • A. N. Fedorets,
  • A. A. Buravleva,
  • S. B. Yarusova,
  • V. Yu. Mayorov,
  • N. B. Kondrikov,
  • I. G. Tananaev,
  • V. I. Sergienko

摘要

In this work the method of obtaining composite ceramics based on perovskite and pyrochlore of compositions YxZrxSr1-3xTiO3 (x = 0.1, x = 0.2, x = 0.3) and Y2(ZrxTi)2O7 (x = 1) using the technology of reactive spark plasma sintering has been investigated. A comprehensive study of phase transformations, structure formation and physical and mechanical characteristics of ceramics depending on the ratio of Sr2+/Y3+/Zr4+ has been carried out by XRD, SEM, EDS and “diffraction movie” methods at the synchrotron radiation source. High hydrolytic stability of ceramics is proved and the mechanism of low leaching rate of Sr2+ < 10–7 g cm−2 day, Y3+ and Zr4+ < 10–5 g cm−2 day is described, which corresponds to GOST R 50926-96 and ANSI/ANS 16.1. The results of the work are promising for conditioning of radioactive waste and production of radioisotope products.

Graphical Abstract