Electron paramagnetic resonance probed oxygen deficiency in SrTiO 3 with different cap layers

Y. S. Chen; H. Y. Guo; Jan Chi Yang; Ying-hao Chu; W. F. Wu; J. G. Lin

doi:10.1063/1.4769786

Electron paramagnetic resonance probed oxygen deficiency in SrTiO ₃ with different cap layers

Y. S. Chen, H. Y. Guo, Jan Chi Yang, Ying-hao Chu, W. F. Wu, J. G. Lin

Department of Materials Science and Engineering

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

5 Scopus citations

Abstract

The oxygen vacancies in the SrTiO₃ (STO) single crystal with two different cap layers, CoFe₂O₄ (CFO) and BiFeO₃ (BFO), are investigated with the technique of electron paramagnetic resonance (EPR). EPR spectra show the resonance lines of the residual oxygen vacancy in air annealed STO, STO/CFO, and STO/BFO, showing the high sensitivity of EPR to the low concentration defects. The experimental results indicate that the oxide cap layers enhance the oxygen deficiency in bulk STO and the amount of oxygen vacancy is dependent on the electronegativity of metal ion in the cap layer. Accordingly, STO/BFO has a larger amount of oxygen vacancy than that of STO/CFO.

Original language	English
Article number	123720
Journal	Journal of Applied Physics
Volume	112
Issue number	12
DOIs	https://doi.org/10.1063/1.4769786
State	Published - 1 Dec 2012

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@article{f0e9aba719ca446ea9dc93c223ed00ed,

title = "Electron paramagnetic resonance probed oxygen deficiency in SrTiO 3 with different cap layers",

abstract = "The oxygen vacancies in the SrTiO3 (STO) single crystal with two different cap layers, CoFe2O4 (CFO) and BiFeO3 (BFO), are investigated with the technique of electron paramagnetic resonance (EPR). EPR spectra show the resonance lines of the residual oxygen vacancy in air annealed STO, STO/CFO, and STO/BFO, showing the high sensitivity of EPR to the low concentration defects. The experimental results indicate that the oxide cap layers enhance the oxygen deficiency in bulk STO and the amount of oxygen vacancy is dependent on the electronegativity of metal ion in the cap layer. Accordingly, STO/BFO has a larger amount of oxygen vacancy than that of STO/CFO.",

author = "Chen, {Y. S.} and Guo, {H. Y.} and {Chi Yang}, Jan and Ying-hao Chu and Wu, {W. F.} and Lin, {J. G.}",

year = "2012",

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doi = "10.1063/1.4769786",

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journal = "Journal of Applied Physics",

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T1 - Electron paramagnetic resonance probed oxygen deficiency in SrTiO 3 with different cap layers

AU - Chen, Y. S.

AU - Guo, H. Y.

AU - Chi Yang, Jan

AU - Chu, Ying-hao

AU - Wu, W. F.

AU - Lin, J. G.

PY - 2012/12/1

Y1 - 2012/12/1

N2 - The oxygen vacancies in the SrTiO3 (STO) single crystal with two different cap layers, CoFe2O4 (CFO) and BiFeO3 (BFO), are investigated with the technique of electron paramagnetic resonance (EPR). EPR spectra show the resonance lines of the residual oxygen vacancy in air annealed STO, STO/CFO, and STO/BFO, showing the high sensitivity of EPR to the low concentration defects. The experimental results indicate that the oxide cap layers enhance the oxygen deficiency in bulk STO and the amount of oxygen vacancy is dependent on the electronegativity of metal ion in the cap layer. Accordingly, STO/BFO has a larger amount of oxygen vacancy than that of STO/CFO.

AB - The oxygen vacancies in the SrTiO3 (STO) single crystal with two different cap layers, CoFe2O4 (CFO) and BiFeO3 (BFO), are investigated with the technique of electron paramagnetic resonance (EPR). EPR spectra show the resonance lines of the residual oxygen vacancy in air annealed STO, STO/CFO, and STO/BFO, showing the high sensitivity of EPR to the low concentration defects. The experimental results indicate that the oxide cap layers enhance the oxygen deficiency in bulk STO and the amount of oxygen vacancy is dependent on the electronegativity of metal ion in the cap layer. Accordingly, STO/BFO has a larger amount of oxygen vacancy than that of STO/CFO.

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