In situ radiation damage studies of La{sub x}Sr{sub 1-3x/2}TiO{sub 3} perovskites
Journal Article
·
· Journal of Applied Physics
- Institute of Materials and Engineering, Australian Nuclear Science and Technology Organisation, PMB 1, Menai, New South Wales 2234 (Australia)
- Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Illinois 60439 (United States)
Seven perovskite samples in the La{sub x}Sr{sub 1-3x/2}TiO{sub 3} solid solution series were monitored in situ during irradiation with 1.0 MeV Kr{sup 2+} ions using the intermediate voltage electron microscope-Tandem User Facility (IVEM) at Argonne National Laboratory. All the perovskites pass through the crystalline-amorphous transformation. However, the critical temperature for amorphisation T{sub c} of the La{sub x}Sr{sub 1-3x/2}TiO{sub 3} perovskites varies nonlinearly with composition, decreasing from 394{+-}3 K for SrTiO{sub 3} to a minimum of 275{+-}1 K for La{sub 0.2}Sr{sub 0.7}TiO{sub 3}, then increasing with composition again to 865{+-}3 K for La{sub 0.67}TiO{sub 3}. In combination with the work of previous authors, the electron microscopy results and IVEM data in this study suggest that there is a vacancy-assisted recovery mechanism in the cubic perovskites with compositions in the range 0<x<0.2 that may not be directly associated with the cubic-tetragonal phase transformation and that vacancy-enhanced amorphisation occurs for both cubic and orthorhombic perovskites with compositions in the range x={approx}0.2-0.67.
- OSTI ID:
- 21137159
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 103; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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