Two regimes of ionization-induced recovery in SrTiO3 under irradiation

SCRIPTA MATERIALIA

卷:173

Article

Weber, William J.^1,2  Xue, Haizhou¹  Zarkadoula, Eva²  Zhang, Yanwen^1,2 

[1] Univ Tennessee, Dept Mat Sci & Engn, 1508 Middle Dr, Knoxville, TN 37996 USA

[2] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

关键词: Rutherford backscattering spectrometry/channeling (RBS);    Recovery;    Perovskite;    Defects;    Molecular dynamics;   

DOI  :  10.1016/j.scriptamat.2019.08.013

来源: Elsevier

【 摘 要 】

Irradiation of pre-damaged SrTiO3 with 2 MeV He, 12 MeV C, 5 MeV C and 12 MeV 0 ions reveals two regimes of ionization-induced recovery. For C and 0 ions, with electronic energy loss between 1.6 and 3 keV/nm, recovery cross-sections range from 0.27 to 0.38 nm(2), and molecular dynamics confirms recovery related to ionization-induced thermal spikes via electron-phonon coupling. At lower electronic energy losses, recovery cross-sections decrease to about 5.5 x 10(-4) nm(2) for 2 MeV He ions and 1.0 x 10(-5) nm(2) for 200 keV electrons, which suggests recovery associated with local electronic excitation processes. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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