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Title: Ion-Beam-Induced Defects and Defect Interactions in Perovskite-Structure Titanates

Abstract

Ion-beam irradiation of perovskite structures results in the production and accumulation of defects. Below a critical temperature, irradiation also leads to a crystalline-to-amorphous transformation. The critical temperature for amorphization under 800 keV Kr{sup +} ion irradiation is 425,440 and 550 K for SrTiO{sub 3}, CaTiO{sub 3} and BaTiO{sub 3}, respectively. The results of ion-channeling studies on SrTiO{sub 3} irradiated with 1.0 MeV Au{sup 2+} ions suggest that the crystalline-to-amorphous transformation is dominated by the accumulation and interaction of irradiation-induced defects. In SiTiO{sub 3} irradiated with He{sup +} and 0{sup +} ions at 180 K, isochronal annealing studies indicate that there is significant recovery of defects on both the oxygen and cation sublattices between 200 and 400 K. These results suggest that defect recovery processes may control the kinetics of amorphization. A fit of the direct-impact/defect-stimulated model to the data for SrTiO{sub 3} suggests that the kinetics of amorphization are controlled by both a nearly athermal irradiation-assisted recovery process with an activation energy of 0.1 plus or minus 0.05 eV and a thermal defect recovery process with an activation energy of 0.6 plus or minus 0.1 eV. In SrTi0{sub 3} implanted with 40 keV H{sup +} to 5.0 x 10{sup 16}more » and 1.0 x 10{sup 17} ions/cm{sup 2}, annealing at 470 K increases the backscattering yield from Sr and Ti and is mostly likely due to the coalescence of H{sub 2} into bubble nuclei. Annealing at 570 K and higher results in the formation of blisters or large cleaved areas.« less

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (US)
Sponsoring Org.:
USDOE Office of Science (US)
OSTI Identifier:
11335
Report Number(s):
ORNL/CP-104443; KC 02 02 02 0
KC 02 02 02 0; TRN: AH200128%%764
DOE Contract Number:  
AC05-96OR22464
Resource Type:
Conference
Resource Relation:
Conference: NATO Advanced Research Workshop, Jurmala (LV), 08/23/1999--08/25/1999; Other Information: PBD: 23 Aug 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ACTIVATION ENERGY; ANNEALING; CRITICAL TEMPERATURE; DEFECTS; ION CHANNELING; NATO; PEROVSKITE; TITANATES

Citation Formats

Boatner, L.A., Jiang, W., Meldrum, A., Thevuthasan, S., Weber, W.J., and Williford, R.E. Ion-Beam-Induced Defects and Defect Interactions in Perovskite-Structure Titanates. United States: N. p., 1999. Web.
Boatner, L.A., Jiang, W., Meldrum, A., Thevuthasan, S., Weber, W.J., & Williford, R.E. Ion-Beam-Induced Defects and Defect Interactions in Perovskite-Structure Titanates. United States.
Boatner, L.A., Jiang, W., Meldrum, A., Thevuthasan, S., Weber, W.J., and Williford, R.E. Mon . "Ion-Beam-Induced Defects and Defect Interactions in Perovskite-Structure Titanates". United States. https://www.osti.gov/servlets/purl/11335.
@article{osti_11335,
title = {Ion-Beam-Induced Defects and Defect Interactions in Perovskite-Structure Titanates},
author = {Boatner, L.A. and Jiang, W. and Meldrum, A. and Thevuthasan, S. and Weber, W.J. and Williford, R.E.},
abstractNote = {Ion-beam irradiation of perovskite structures results in the production and accumulation of defects. Below a critical temperature, irradiation also leads to a crystalline-to-amorphous transformation. The critical temperature for amorphization under 800 keV Kr{sup +} ion irradiation is 425,440 and 550 K for SrTiO{sub 3}, CaTiO{sub 3} and BaTiO{sub 3}, respectively. The results of ion-channeling studies on SrTiO{sub 3} irradiated with 1.0 MeV Au{sup 2+} ions suggest that the crystalline-to-amorphous transformation is dominated by the accumulation and interaction of irradiation-induced defects. In SiTiO{sub 3} irradiated with He{sup +} and 0{sup +} ions at 180 K, isochronal annealing studies indicate that there is significant recovery of defects on both the oxygen and cation sublattices between 200 and 400 K. These results suggest that defect recovery processes may control the kinetics of amorphization. A fit of the direct-impact/defect-stimulated model to the data for SrTiO{sub 3} suggests that the kinetics of amorphization are controlled by both a nearly athermal irradiation-assisted recovery process with an activation energy of 0.1 plus or minus 0.05 eV and a thermal defect recovery process with an activation energy of 0.6 plus or minus 0.1 eV. In SrTi0{sub 3} implanted with 40 keV H{sup +} to 5.0 x 10{sup 16} and 1.0 x 10{sup 17} ions/cm{sup 2}, annealing at 470 K increases the backscattering yield from Sr and Ti and is mostly likely due to the coalescence of H{sub 2} into bubble nuclei. Annealing at 570 K and higher results in the formation of blisters or large cleaved areas.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {8}
}

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