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

Research output: Contribution to journalArticle

93 Citations (Scopus)

Abstract

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
Volume288
Issue number2-3
DOIs
Publication statusPublished - Feb 2001
Externally publishedYes

    Fingerprint

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