Accommodation of uranium into the garnet structure

Sergey V. Yudintsev, Marya I. Lapina, Alexander G. Ptashkin, Tatiana S. Ioudintseva, Satoshi Utsunomiya, Lumin M. Wang, Rodney C. Ewing

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Abstract

One promising host for actinide wastes is garnet-type phases of general formula AVIII3BVI2[XO4]3. To determine the isomorphic capacity of garnet for uranium, CaO - Fe2O3 - Al2O3 - SiO2 - ZrO2 - Gd2O3 - UO2 system was studied. Experiments were performed in air medium at 1400 - 1500°C and 1 atm. The garnets have high capacity for Gd and Zr, while incorporation of U was found to be greatly dependent on the phase composition. Uranium content decreased from 18 wt.% in Ca-Zr-Fe garnet to 0.6 wt.% in Si-doped phases. Heavy ion irradiation (1.0 MeV Kr++) experiments were carried out for a garnet with maximal U content, (Ca2,7U0,3) VIII(Zr1,7Fe0,3) VI(Al1,1Fe1,9)IV O12. Amorphization dose of the phase was equal to 1.63×1014 ions/cm2 that is close to the other actinide hosts, such as pyrochlore Gd2Ti2O7.

Original languageEnglish
Pages (from-to)477-480
Number of pages4
JournalMaterials Research Society Symposium - Proceedings
Volume713
Publication statusPublished - Jan 1 2002
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Yudintsev, S. V., Lapina, M. I., Ptashkin, A. G., Ioudintseva, T. S., Utsunomiya, S., Wang, L. M., & Ewing, R. C. (2002). Accommodation of uranium into the garnet structure. Materials Research Society Symposium - Proceedings, 713, 477-480.