Ion velocity effect governs damage annealing process in defective KTaO3

G. Velişa; D. Iancu; E. Zarkadoula; Y. Tong; Y. Zhang; W. J. Weber

doi:10.1088/1361-6463/ad53da

Ion velocity effect governs damage annealing process in defective KTaO₃

G. Velişa, D. Iancu, E. Zarkadoula, Y. Tong, Y. Zhang, W. J. Weber

Nanomaterials Theory Institute

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

Effects of electronic to nuclear energy losses (S _e/S _n) ratio on damage evolution in defective KTaO₃ have been investigated by irradiating pre-damaged single crystal KTaO₃ with intermediate energy O ions (6 MeV, 8 MeV and 12 MeV) at 300 K. By exploring these processes in pre-damaged KTaO₃ containing a fractional disorder level of 0.35, the results demonstrate the occurrence of a precursory stage of damage production before the onset of damage annealing process in defective KTaO₃ that decreases with O ion energy. The observed ionization-induced annealing process by ion channeling analysis has been further mirrored by high resolution transmission electron microscopy analysis. In addition, the reduction of disorder level is accompanied by the broadening of the disorder profiles to greater depth with increasing ion fluence, and enhanced migration is observed with decreasing O ion energy. Since S _e (∼3.0 keV nm⁻¹) is nearly constant for all 3 ion energies across the pre-damaged depth, the difference in behavior is due to the so-called ‘velocity effect’: the lower ion velocity below the Bragg peak yields a confined spread of the electron cascade and hence an increased energy deposition density. The inelastic thermal spike calculation has further confirmed the existence of a velocity effect, not previously reported in KTaO₃ or very scarcely reported in other materials for which the existence of ionization-induced annealing has been reported.

Original language	English
Article number	365303
Journal	Journal of Physics D: Applied Physics
Volume	57
Issue number	36
DOIs	https://doi.org/10.1088/1361-6463/ad53da
State	Published - Sep 13 2024

Funding

This work was supported by a grant of the Romanian Ministry of Education and Research, CNCS—UEFISCDI, Project Number PN-III-P4- IDPCE2020- 1379, within PNCDI III. Experiments were carried out at 3 MV Tandetron™ accelerator from ‘Horia Hulubei’ National Institute for Physics and Nuclear Engineering (IFIN-HH) and were supported by the Romanian Government Programme through the National Programme for Infrastructure of National Interest (IOSIN). The contributions of D Iancu and G Velişa to this work were also supported by the Research Programme Partnership in Priority Areas PNII MEN-UEFISCDI, Contract PN 23210201. Y Zhang was supported as part of the Laboratory Directed Research and Development Program at Idaho National Laboratory under the Department of Energy (DOE) Idaho Operations Office (an agency of the U.S. Government) Contract DE-AC07-05ID145142. The contribution of W J Weber was supported by the U.S. National Science Foundation under Grant No. DMR-2104228. EZ (theory and simulation works) was supported by the Center for Nanophase Materials Sciences, (CNMS), which is a U.S. Department of Energy, Office of Science User Facility at Oak Ridge National Laboratory. Y T gratefully acknowledges the financial support by the National Natural Science Foundation of China (Grant Nos. 52001272, 52371164), Taishan Scholars Program of Shandong Province (tsqn202103052), Yantai city matching fund for Taishan Scholars Program of Shandong Province.

Keywords

HTEM
KTaO
defect analyses
defects simulation
velocity effect

Access to Document

10.1088/1361-6463/ad53da

Cite this

@article{9483645fa5d94c99b54f8967475c2b80,

title = "Ion velocity effect governs damage annealing process in defective KTaO3",

abstract = "Effects of electronic to nuclear energy losses (S e/S n) ratio on damage evolution in defective KTaO3 have been investigated by irradiating pre-damaged single crystal KTaO3 with intermediate energy O ions (6 MeV, 8 MeV and 12 MeV) at 300 K. By exploring these processes in pre-damaged KTaO3 containing a fractional disorder level of 0.35, the results demonstrate the occurrence of a precursory stage of damage production before the onset of damage annealing process in defective KTaO3 that decreases with O ion energy. The observed ionization-induced annealing process by ion channeling analysis has been further mirrored by high resolution transmission electron microscopy analysis. In addition, the reduction of disorder level is accompanied by the broadening of the disorder profiles to greater depth with increasing ion fluence, and enhanced migration is observed with decreasing O ion energy. Since S e (∼3.0 keV nm−1) is nearly constant for all 3 ion energies across the pre-damaged depth, the difference in behavior is due to the so-called {\textquoteleft}velocity effect{\textquoteright}: the lower ion velocity below the Bragg peak yields a confined spread of the electron cascade and hence an increased energy deposition density. The inelastic thermal spike calculation has further confirmed the existence of a velocity effect, not previously reported in KTaO3 or very scarcely reported in other materials for which the existence of ionization-induced annealing has been reported.",

keywords = "HTEM, KTaO, defect analyses, defects simulation, velocity effect",

author = "G. Veli{\c s}a and D. Iancu and E. Zarkadoula and Y. Tong and Y. Zhang and Weber, \{W. J.\}",

note = "Publisher Copyright: {\textcopyright} 2024 IOP Publishing Ltd.",

year = "2024",

month = sep,

day = "13",

doi = "10.1088/1361-6463/ad53da",

language = "English",

volume = "57",

journal = "Journal of Physics D: Applied Physics",

issn = "0022-3727",

publisher = "IOP Publishing",

number = "36",

}

TY - JOUR

T1 - Ion velocity effect governs damage annealing process in defective KTaO3

AU - Velişa, G.

AU - Iancu, D.

AU - Zarkadoula, E.

AU - Tong, Y.

AU - Zhang, Y.

AU - Weber, W. J.

PY - 2024/9/13

Y1 - 2024/9/13

N2 - Effects of electronic to nuclear energy losses (S e/S n) ratio on damage evolution in defective KTaO3 have been investigated by irradiating pre-damaged single crystal KTaO3 with intermediate energy O ions (6 MeV, 8 MeV and 12 MeV) at 300 K. By exploring these processes in pre-damaged KTaO3 containing a fractional disorder level of 0.35, the results demonstrate the occurrence of a precursory stage of damage production before the onset of damage annealing process in defective KTaO3 that decreases with O ion energy. The observed ionization-induced annealing process by ion channeling analysis has been further mirrored by high resolution transmission electron microscopy analysis. In addition, the reduction of disorder level is accompanied by the broadening of the disorder profiles to greater depth with increasing ion fluence, and enhanced migration is observed with decreasing O ion energy. Since S e (∼3.0 keV nm−1) is nearly constant for all 3 ion energies across the pre-damaged depth, the difference in behavior is due to the so-called ‘velocity effect’: the lower ion velocity below the Bragg peak yields a confined spread of the electron cascade and hence an increased energy deposition density. The inelastic thermal spike calculation has further confirmed the existence of a velocity effect, not previously reported in KTaO3 or very scarcely reported in other materials for which the existence of ionization-induced annealing has been reported.

AB - Effects of electronic to nuclear energy losses (S e/S n) ratio on damage evolution in defective KTaO3 have been investigated by irradiating pre-damaged single crystal KTaO3 with intermediate energy O ions (6 MeV, 8 MeV and 12 MeV) at 300 K. By exploring these processes in pre-damaged KTaO3 containing a fractional disorder level of 0.35, the results demonstrate the occurrence of a precursory stage of damage production before the onset of damage annealing process in defective KTaO3 that decreases with O ion energy. The observed ionization-induced annealing process by ion channeling analysis has been further mirrored by high resolution transmission electron microscopy analysis. In addition, the reduction of disorder level is accompanied by the broadening of the disorder profiles to greater depth with increasing ion fluence, and enhanced migration is observed with decreasing O ion energy. Since S e (∼3.0 keV nm−1) is nearly constant for all 3 ion energies across the pre-damaged depth, the difference in behavior is due to the so-called ‘velocity effect’: the lower ion velocity below the Bragg peak yields a confined spread of the electron cascade and hence an increased energy deposition density. The inelastic thermal spike calculation has further confirmed the existence of a velocity effect, not previously reported in KTaO3 or very scarcely reported in other materials for which the existence of ionization-induced annealing has been reported.

KW - HTEM

KW - KTaO

KW - defect analyses

KW - defects simulation

KW - velocity effect

UR - https://www.scopus.com/pages/publications/85196166421

U2 - 10.1088/1361-6463/ad53da

DO - 10.1088/1361-6463/ad53da

M3 - Article

AN - SCOPUS:85196166421

SN - 0022-3727

VL - 57

JO - Journal of Physics D: Applied Physics

JF - Journal of Physics D: Applied Physics

IS - 36

M1 - 365303

ER -