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Title: Ion beam irradiation of lanthanum compounds in the series La2O3-TiO2
Authors: Whittle, KR
Blackford, MG
Aughterson, RD
Smith, KL
Lumpkin, GR
Zaluzec, NK
Keywords: Lanthanum
Ion beams
Crystal structure
Electron microscopes
Issue Date: 8-Apr-2010
Publisher: Materials Research Society
Citation: 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. 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 (Symposium AA), 157-162(1265-AA08-05-BB07-05). doi:10.1557/PROC-1265-AA08-05-BB07-05
Abstract: 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.
Gov't Doc #: 3168
ISBN: 9781605112428
ISSN: 0272-9172
Appears in Collections:Conference Publications

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