Ion-beam irradiation of lanthanum compounds in the systems La{sub 2}O{sub 3}-Al{sub 2}O{sub 3} and La{sub 2}O{sub 3}-TiO{sub 2}

Journal Article · Fri Oct 15 00:00:00 EDT 2010 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2010.07.033· OSTI ID:21421488

Lumpkin, Gregory R; Blackford, Mark G; Aughterson, Robert D; Smith, Katherine L ^[1]; Zaluzec, Nestor J ^[2]

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1. Institute of Materials Engineering, Australian Nuclear Science and Technology Organisation, PMB 1, Menai, NSW 2234 (Australia)
2. Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, IL 60439 (United States)

Thin crystals of La{sub 2}O{sub 3}, LaAlO{sub 3}, La{sub 2/3}TiO{sub 3}, La{sub 2}TiO{sub 5}, and La{sub 2}Ti{sub 2}O{sub 7} have been irradiated in situ using 1 MeV Kr{sup 2+} ions at the Intermediate Voltage Electron Microscope-Tandem User Facility (IVEM-Tandem), Argonne National Laboratory (ANL). We observed that La{sub 2}O{sub 3} remained crystalline to a fluence greater than 3.1x10{sup 16} ions cm{sup -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 (T{sub c}) of 647 K for LaAlO{sub 3}, 840 K for La{sub 2}Ti{sub 2}O{sub 7}, 865 K for La{sub 2/3}TiO{sub 3}, and 1027 K for La{sub 2}TiO{sub 5}. The T{sub c} values observed in this study, together with previous data for Al{sub 2}O{sub 3} and TiO{sub 2}, are discussed with reference to the melting points for the La{sub 2}O{sub 3}-Al{sub 2}O{sub 3} and La{sub 2}O{sub 3}-TiO{sub 2} systems and the different local environments within the four crystal structures. Results suggest that there is an observable inverse correlation between T{sub c} and melting temperature (T{sub m}) in the two systems. More complex relationships exist between T{sub c} and crystal structure, with the stoichiometric perovskite LaAlO{sub 3} being the most resistant to amorphisation. - Graphical abstract: La{sub 2}TiO{sub 5} with atypical co-ordination for Ti, TiO{sub 5} is found to be different in radiation resistance to La{sub 2}Ti{sub 2}O{sub 7} and La{sub 2/3}TiO{sub 3}. Irradiation of La-Ti-O, and La-Al-O based systems has found that radiation damage resistance is related to the ability of the system to disorder.

• OSTI ID: 21421488
• Journal Information: Journal of Solid State Chemistry, Vol. 183, Issue 10; Other Information: DOI: 10.1016/j.jssc.2010.07.033; PII: S0022-4596(10)00315-4; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINATES
ALUMINIUM OXIDES
AMORPHOUS STATE
CRITICAL TEMPERATURE
CRYSTAL STRUCTURE
CRYSTALS
ELECTRON MICROSCOPES
ION BEAMS
IRRADIATION
KRYPTON IONS
LANTHANUM OXIDES
MELTING POINTS
MEV RANGE 01-10
PEROVSKITE
PHYSICAL RADIATION EFFECTS
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0400-1000 K
TITANATES
TITANIUM OXIDES
ALUMINIUM COMPOUNDS
BEAMS
CHALCOGENIDES
CHARGED PARTICLES
ENERGY RANGE
IONS
LANTHANUM COMPOUNDS
MEV RANGE
MICROSCOPES
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PEROVSKITES
PHYSICAL PROPERTIES
RADIATION EFFECTS
RARE EARTH COMPOUNDS
TEMPERATURE RANGE
THERMODYNAMIC PROPERTIES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE