Microstructure and performance studies of (Mo, Ru, Pd, Zr) tetra-doped gadolinium zirconate pyrochlore

Xiaoyan Shu, Long Fan, Chenxi Hou, Tao Duan, Yanlin Wu, Fangting Chi, Dengsheng Ma, Xirui Lu

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Proper disposal of nuclear waste with multi-nuclides and multi-valence is still challenge. A series of (Mo, Ru, Pd, Zr) tetra-doped Gd2Zr2O7 ceramics were studied to understand the microstructure and performance evolution of nuclear waste forms that immobilised simulated waste after trialkyl phosphine oxides (TRPO) process. The structure of as-obtained samples were tested by X-ray diffraction, Raman, scanning electron microscope, electron back-scattered diffraction, and energy-dispersive X-ray spectroscopy, while the mechanical and chemical performance were characterised by Vickers hardness and aqueous leaching method. The results indicate that the mechanical behaviour are closely linked with the phase structure, and the highest Vickers hardness is obtained at the phase turning point. The leaching results show that the normalised leaching rate (LR) of the doped elements decrease in the order of Mo, Ru, Pd, Zr. After reaching equilibrium, their LR are as low as 4.12 × 10−4 g·m−2·d−1, 1.50 × 10−5g·m−2·d−1, 1.30 × 10−5 g·m−2·d−1, and 2.09 × 10−7 g·m−2·d−1, respectively.

Original languageEnglish
Pages (from-to)272-277
Number of pages6
JournalAdvances in Applied Ceramics
Volume116
Issue number5
DOIs
Publication statusPublished - 2017 Jul 4

Keywords

  • Pyrochlore
  • Raman
  • TRPO waste
  • chemical durability
  • fluorite
  • hardness
  • phase transformation
  • waste forms

ASJC Scopus subject areas

  • Ceramics and Composites
  • Industrial and Manufacturing Engineering

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