Defect accommodation in off-stoichiometric (SrTiO 3 )n SrO Ruddlesden–Popper superlattices studied with positron annihilation spectroscopy
Abstract
he low dielectric loss underlying the record performance of strained (SrTiO3)nSrO Ruddlesden–Popper films as tunable microwave dielectrics was postulated to arise from (SrO)2 faults accommodating local non-stoichiometric defects. Here, we explore the effect of non-stoichiometry on (SrTiO3)nSrO using positron annihilation lifetime spectroscopy on a composition series of 300 nm thick n = 6 (Sr1+δTiO3)nSrO thin films. These films show titanium-site vacancies across the stoichiometry series, with evidence that TiOx vacancy complexes dominate. Little change in defect populations is observed across the series, indicating the ability of Ruddlesden–Popper phases to accommodate ± 5% off-stoichiometry. This ability for defect accommodation is corroborated by scanning transmission electron microscopy with electron energy loss spectroscopy.
- Authors:
-
[1];
[2];
[5];
[6];
[7]
- Cornell Univ., Ithaca, NY (United States). Department of Materials Science and Engineering
- Cornell Univ., Ithaca, NY (United States). School of Applied and Engineering Physics; Kavli Inst. at Cornell for Nanoscale Science, Ithaca, NY (United States).
- Univ. Bundeswehr München (Germany)
- Cornell University, Ithaca, New York (United States). Department of Materials Science and Engineering
- Cornell Univ., Ithaca, NY (United States). School of Applied and Engineering Physics; Kavli Inst. at Cornell for Nanoscale Science, Ithaca, NY (United States).
- Univ. of Dundee, (United Kingdom)
- Cornell Univ., Ithaca, NY (United States). Department of Materials Science and Engineering; Kavli Inst. at Cornell for Nanoscale Science, Ithaca, NY (United States); Leibniz-Institut für Kristallzüchtung (Germany)
- Publication Date:
- Research Org.:
- Cornell Univ., Ithaca, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1801571
- Alternate Identifier(s):
- OSTI ID: 1647274
- Grant/Contract Number:
- SC0002334
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Applied Physics Letters
- Additional Journal Information:
- Journal Volume: 117; Journal Issue: 6; Journal ID: ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- Physics
Citation Formats
Dawley, Natalie M., Goodge, Berit H., Egger, Werner, Barone, Matthew R., Kourkoutis, Lena F., Keeble, David J., and Schlom, Darrell G. Defect accommodation in off-stoichiometric (SrTiO 3 )n SrO Ruddlesden–Popper superlattices studied with positron annihilation spectroscopy. United States: N. p., 2020.
Web. doi:10.1063/5.0011136.
Dawley, Natalie M., Goodge, Berit H., Egger, Werner, Barone, Matthew R., Kourkoutis, Lena F., Keeble, David J., & Schlom, Darrell G. Defect accommodation in off-stoichiometric (SrTiO 3 )n SrO Ruddlesden–Popper superlattices studied with positron annihilation spectroscopy. United States. https://doi.org/10.1063/5.0011136
Dawley, Natalie M., Goodge, Berit H., Egger, Werner, Barone, Matthew R., Kourkoutis, Lena F., Keeble, David J., and Schlom, Darrell G. Mon .
"Defect accommodation in off-stoichiometric (SrTiO 3 )n SrO Ruddlesden–Popper superlattices studied with positron annihilation spectroscopy". United States. https://doi.org/10.1063/5.0011136. https://www.osti.gov/servlets/purl/1801571.
@article{osti_1801571,
title = {Defect accommodation in off-stoichiometric (SrTiO 3 )n SrO Ruddlesden–Popper superlattices studied with positron annihilation spectroscopy},
author = {Dawley, Natalie M. and Goodge, Berit H. and Egger, Werner and Barone, Matthew R. and Kourkoutis, Lena F. and Keeble, David J. and Schlom, Darrell G.},
abstractNote = {he low dielectric loss underlying the record performance of strained (SrTiO3)nSrO Ruddlesden–Popper films as tunable microwave dielectrics was postulated to arise from (SrO)2 faults accommodating local non-stoichiometric defects. Here, we explore the effect of non-stoichiometry on (SrTiO3)nSrO using positron annihilation lifetime spectroscopy on a composition series of 300 nm thick n = 6 (Sr1+δTiO3)nSrO thin films. These films show titanium-site vacancies across the stoichiometry series, with evidence that TiOx vacancy complexes dominate. Little change in defect populations is observed across the series, indicating the ability of Ruddlesden–Popper phases to accommodate ± 5% off-stoichiometry. This ability for defect accommodation is corroborated by scanning transmission electron microscopy with electron energy loss spectroscopy.},
doi = {10.1063/5.0011136},
journal = {Applied Physics Letters},
number = 6,
volume = 117,
place = {United States},
year = {Mon Aug 10 00:00:00 EDT 2020},
month = {Mon Aug 10 00:00:00 EDT 2020}
}
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