In situ radiation damage studies of La{sub x}Sr{sub 1-3x/2}TiO{sub 3} perovskites.

Journal Article · Tue Jan 01 04:00:00 EST 2008 · J. Appl. Phys.

DOI:https://doi.org/10.1063/1.2901183· OSTI ID:1000694

Smith, K L; Lumpkin, G R; Blackford, M G; Colella, M; Zaluzec, N J

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 amorphization 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 amorphization occurs for both cubic and orthorhombic perovskites with compositions in the range x = -0.2-0.67.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1000694
• Report Number(s): ANL/MSD/JA-68718
• Journal Information: J. Appl. Phys., Journal Name: J. Appl. Phys. Journal Issue: 2008 Vol. 103; ISSN 0021-8979
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANL
CRITICAL TEMPERATURE
ELECTRON MICROSCOPY
ELECTRONS
IRRADIATION
PEROVSKITE
PEROVSKITES
PHASE TRANSFORMATIONS
RADIATIONS
SOLID SOLUTIONS