Heavy-ion irradiation effects on structures and acid dissolution of pyrochlores

B. D. Begg, N. J. Hess, W. J. Weber, R. Devanathan, J. P. Icenhower, S. Thevuthasan, B. P. McGrail

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The temperature dependence of the critical dose for amorphization, using 0.6 MeV Bi+ ions, for A2Ti2O7 pyrochlores, in which A = Y, Sm, Gd and Lu, exhibits no significant effect of A-site ion mass or size. The room temperature dose for amorphization was found to be approximately 0.18 dpa in each case. After irradiation with 2 MeV Au2+ ions glancing-incidence X-ray diffraction (XRD) revealed that each pyrochlore underwent an irradiation-induced structural transformation to fluorite in conjunction with amorphization. The effect of amorphization on the dissolution rates of fully dense pyrochlores, at 90 °C and pH 2 (nitric acid) varied from a factor of 10 to 15 increase for Gd2Ti2O7 to none for Y2Ti2O7. Significant differences were observed in the A-site dissolution rates from the crystalline pyrochlores, indicating differences in the manner in which the A-site cations are incorporated into the pyrochlore structure. These indications were supported by Raman spectroscopy.

Original languageEnglish
Pages (from-to)208-216
Number of pages9
JournalJournal of Nuclear Materials
Issue number2-3
Publication statusPublished - Feb 2001
Externally publishedYes


ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

Begg, B. D., Hess, N. J., Weber, W. J., Devanathan, R., Icenhower, J. P., Thevuthasan, S., & McGrail, B. P. (2001). Heavy-ion irradiation effects on structures and acid dissolution of pyrochlores. Journal of Nuclear Materials, 288(2-3), 208-216. https://doi.org/10.1016/S0022-3115(00)00708-X