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Synroc Waste Solution: Polyphase Ceramic Forms for Nuclear Waste Management

Learn about Synroc, an innovative ceramic waste form developed in Australia, with the potential to treat radioactive wastes worldwide. Discover its benefits compared to glass waste, including higher waste loadings, phase-specific accommodation of elements, higher thermal conductivity, and tolerance to radiation damage, leaching, and chemical degradation.

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Synroc Waste Solution: Polyphase Ceramic Forms for Nuclear Waste Management

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  1. Materials Research Society Scientific Basis for Nuclear Waste Management Symposium 2017 Novel Complex Ceramic Oxides for Polyphase Ceramic Waste-Forms Robert Aughterson Gregory R. Lumpkin, Katherine L. Smith, Julie M. Cairney

  2. Synroc: the waste solution • Synroc conceived in Australia and technology developed at ANSTO • Potential to treat radioactive wastes world wide • Benefits relative to glass waste; • Higher waste loadings (Waste volume reduction) • Phase specific accommodation of elements. • Higher thermal conductivity. • Tolerance; radiation damage, leaching, chemical degradation.

  3. Synroc Poly-phase Types Lumpkin, G.R., Ceramic waste forms for actinides. Elements, 2006. 2(6): p. 365-372.

  4. Ln2TiO5 (Ln = lanthanide) temperature stability Y.F. Shepelev and M.A. Petrova, “Crystal Structures of Ln2TiO5…” In. Mat., Vol. 44, 12, (2008)

  5. Ln2TiO5 (multi-lanthanides) SEM back-scattered imaging Sm0.1Gd0.4Dy0.4Yb1.1TiO5 Sm0.2Gd0.2Dy0.2Yb1.4TiO5

  6. Ln2TiO5 (multi-lanthanides) X-ray Diffraction

  7. In-situ Ion-Irradiation with Transmission Electron Microscopy Characterisation Dose 1 Dose = 0 Amorphous Dose 3 Dose 2

  8. In-situ Ion-Irradiation with Transmission Electron Microscopy Characterisation Sm0.2Gd0.2Dy0.2Yb1.4TiO5

  9. In-situ Ion-Irradiation with Transmission Electron Microscopy Characterisation Hexagonal Sm0.2Gd0.2Dy0.2Yb1.4TiO5

  10. Summary • 2 out of the 4 mixed lanthanide titanates were single phase. Limited solubility with larger lanthanides. • 1 cubic and 3 hexagonal structured. Structure of Ln2TiO5 has a significant effect on radiation response. • Sm0.2Gd0.2Dy0.2Yb1.4TiO5 compound (cubic, defect fluorite structure) had Tc of ~810 K.

  11. Thank You

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