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Materials 2016, 9(11), 883; doi:10.3390/ma9110883

Investigation of Electric Field–Induced Structural Changes at Fe-Doped SrTiO3 Anode Interfaces by Second Harmonic Generation

1
Physics & Astronomy, Hunter College, the City University of New York, 695 Park Avenue, New York, NY 10065, USA
2
The Graduate Center, the City University of New York, 365 5th Ave., New York, NY 10016, USA
3
Materials Science and Engineering, the Pennsylvania State University, University Park, PA 16802, USA
4
Materials Research Institute, the Pennsylvania State University, University Park, PA 16802, USA
5
Material Science and Engineering, North Carolina State University, Raleigh, NC 27695, USA
6
Optical Science and Engineering, and Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Fudan University, Shanghai 200433, China
*
Author to whom correspondence should be addressed.
Academic Editor: Lorena Pardo
Received: 16 September 2016 / Revised: 18 October 2016 / Accepted: 27 October 2016 / Published: 31 October 2016
(This article belongs to the Special Issue Microwave Absorbing and Energy Storage Materials)
View Full-Text   |   Download PDF [5146 KB, uploaded 31 October 2016]   |  

Abstract

We report on the detection of electric field–induced second harmonic generation (EFISHG) from the anode interfaces of reduced and oxidized Fe-doped SrTiO3 (Fe:STO) single crystals. For the reduced crystal, we observe steady enhancements of the susceptibility components as the imposed dc-voltage increases. The enhancements are attributed to a field-stabilized electrostriction, leading to Fe:Ti-O bond stretching and bending in Fe:Ti-O6 octahedra. For the oxidized crystal, no obvious structural changes are observed below 16 kV/cm. Above 16 kV/cm, a sharp enhancement of the susceptibilities occurs due to local electrostrictive deformations in response to oxygen vacancy migrations away from the anode. Differences between the reduced and oxidized crystals are explained by their relative oxygen vacancy and free carrier concentrations which alter internal electric fields present at the Pt/Fe:STO interfaces. Our results show that the optical SHG technique is a powerful tool for detecting structural changes near perovskite-based oxide interfaces due to field-driven oxygen vacancy migration. View Full-Text
Keywords: anodes; ceramics; electrostriction; oxides; perovskites; second harmonic generation anodes; ceramics; electrostriction; oxides; perovskites; second harmonic generation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Ascienzo, D.; Yuan, H.; Greenbaum, S.; Bayer, T.J.M.; Maier, R.A.; Wang, J.-J.; Randall, C.A.; Dickey, E.C.; Zhao, H.; Ren, Y. Investigation of Electric Field–Induced Structural Changes at Fe-Doped SrTiO3 Anode Interfaces by Second Harmonic Generation. Materials 2016, 9, 883.

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