Ion beam irradiation of lanthanum compounds in the series La2O3-TiO2

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Materials Research Society
Thin crystals of La2O3, La2/3TiO3, La2TiO5, and La2Ti2O7 have been irradiated in situ using 1 MeV Kr2+ ions in the Intermediate Voltage Electron Microscope-Tandem User Facility (IVEM-Tandem), at the Argonne National Laboratory (ANL). We observed that La2O3 remained crystalline to a fluence greater than 3.1 × 1016 ions cm-2 at a temperature of 50 K. The four binary oxide compounds in the two systems were observed through the crystalline-amorphous transition as a function of ion fluence and temperature. Results from the ion irradiations give critical temperatures for amorphisation (Tc) of 840 K for La2Ti2O7, 865 K for La2/3TiO3, and 1027 K for La2TiO5. The Tc values observed in this study, together with previous data for TiO2, are discussed with reference to the phase diagrams for La2O3-TiO2 systems and the different local environments within the crystal structures. Results suggest an observable inverse correlation between Tc and melting temperature (Tm) in the two systems.
Lanthanum, Ion beams, Irradiation, ANL, Crystal structure, Electron microscopes
Whittle, K. R., Blackford, M. G., Aughterson, R. D., Smith, K. L., Lumpkin, G. R., & Zaluzec, N. K. (2010). Ion beam irradiation of lanthanum compounds in the series La2O3-TiO2. Paper presented to the 34th International Symposium on the Scientific Basis for Nuclear Waste Management (2010 MRS Spring Meeting), 5th - 9th April 2010. San Francisco, California: Moscone West and San Francisco Marriott. In K. L. Smith, S. Kroeker, B. Uberuaga, K. R. Whittle (Eds.), Scientific Basis for Nuclear Waste Management XXXIV, 1265 157-162. doi:10.1557/PROC-1265-AA08-05-BB07-05