Single crystals of Sm 2Ti 2O 7 were irradiated with 1.0 MeV Au + at 170, 300, and 700K to study the accumulation of atomic disorder on both the Sm and O sublattices using in situ RBS and NRA along the substrate. The nonlinear damage evolution is consistent with disorder accumulation model, which indicates a role of amorphization process. It was found that at low ion fluences, the disorder on the O sublattice is higher than that for Sm, which suggests differences in threshold displacement energies, defect configurations or defect stability. The increase in exchange between O in the near critical temperature for amorphization suggested a correlation between oxygen vacancy mobility and the critical temperature.
ASJC Scopus subject areas
- Physics and Astronomy(all)