Detection of Nanoscale Structural Defects in Degraded Fe-Doped SrTiO3 by Ultrafast Photoacoustic Waves

Ying Zhang; Onur Kurt; David Ascienzo; Qian Yang; Tony Le; Steve Greenbaum; Thorsten J.M. Bayer; Clive A. Randall; Yuhang Ren

doi:10.1021/acs.jpcc.8b03240

Detection of Nanoscale Structural Defects in Degraded Fe-Doped SrTiO₃ by Ultrafast Photoacoustic Waves

Ying Zhang, Onur Kurt, David Ascienzo, Qian Yang, Tony Le, Steve Greenbaum, Thorsten J.M. Bayer, Clive A. Randall, Yuhang Ren

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9 Scopus citations

Abstract

Strontium titanate, SrTiO₃, has been intensively investigated as a model material in defect chemistry research. The underlying mechanism of the effects associated with a large variety of defects often requires microstructure imaging. In the present work, the distribution of nanoscale structural defects in electrodegraded Fe-doped SrTiO₃ (Fe:STO) single crystals is directly revealed by ultrafast photoacoustic waves. We utilized time-resolved reflectance spectra to nondestructively characterize local structural distortions near the degraded anode and cathode interfaces in both the reduced and oxidized crystals along with transmission electron microscopy to image these defects. We show that an accumulation of oxygen vacancies resulted in significant structural deformations near the degraded cathode interface of the reduced crystal. The defect distribution shows a strong dependence on oxygen vacancy concentration and diffusion within the crystals.

Original language	English (US)
Pages (from-to)	12864-12868
Number of pages	5
Journal	Journal of Physical Chemistry C
Volume	122
Issue number	24
DOIs	https://doi.org/10.1021/acs.jpcc.8b03240
State	Published - Jun 21 2018

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
General Energy
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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10.1021/acs.jpcc.8b03240

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title = "Detection of Nanoscale Structural Defects in Degraded Fe-Doped SrTiO3 by Ultrafast Photoacoustic Waves",

abstract = "Strontium titanate, SrTiO3, has been intensively investigated as a model material in defect chemistry research. The underlying mechanism of the effects associated with a large variety of defects often requires microstructure imaging. In the present work, the distribution of nanoscale structural defects in electrodegraded Fe-doped SrTiO3 (Fe:STO) single crystals is directly revealed by ultrafast photoacoustic waves. We utilized time-resolved reflectance spectra to nondestructively characterize local structural distortions near the degraded anode and cathode interfaces in both the reduced and oxidized crystals along with transmission electron microscopy to image these defects. We show that an accumulation of oxygen vacancies resulted in significant structural deformations near the degraded cathode interface of the reduced crystal. The defect distribution shows a strong dependence on oxygen vacancy concentration and diffusion within the crystals.",

author = "Ying Zhang and Onur Kurt and David Ascienzo and Qian Yang and Tony Le and Steve Greenbaum and Bayer, {Thorsten J.M.} and Randall, {Clive A.} and Yuhang Ren",

note = "Funding Information: Research at Hunter was supported by AFOSR grants (grant no. FA9550-17-1-0342 and FA9550-17-1-0339). Research at PSU was supported by an AFOSR grant (grant no. FA9550-14-1-0067). Publisher Copyright: {\textcopyright} 2018 American Chemical Society.",

year = "2018",

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doi = "10.1021/acs.jpcc.8b03240",

language = "English (US)",

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T1 - Detection of Nanoscale Structural Defects in Degraded Fe-Doped SrTiO3 by Ultrafast Photoacoustic Waves

AU - Zhang, Ying

AU - Kurt, Onur

AU - Ascienzo, David

AU - Yang, Qian

AU - Le, Tony

AU - Greenbaum, Steve

AU - Bayer, Thorsten J.M.

AU - Randall, Clive A.

AU - Ren, Yuhang

N1 - Funding Information: Research at Hunter was supported by AFOSR grants (grant no. FA9550-17-1-0342 and FA9550-17-1-0339). Research at PSU was supported by an AFOSR grant (grant no. FA9550-14-1-0067). Publisher Copyright: © 2018 American Chemical Society.

PY - 2018/6/21

Y1 - 2018/6/21

N2 - Strontium titanate, SrTiO3, has been intensively investigated as a model material in defect chemistry research. The underlying mechanism of the effects associated with a large variety of defects often requires microstructure imaging. In the present work, the distribution of nanoscale structural defects in electrodegraded Fe-doped SrTiO3 (Fe:STO) single crystals is directly revealed by ultrafast photoacoustic waves. We utilized time-resolved reflectance spectra to nondestructively characterize local structural distortions near the degraded anode and cathode interfaces in both the reduced and oxidized crystals along with transmission electron microscopy to image these defects. We show that an accumulation of oxygen vacancies resulted in significant structural deformations near the degraded cathode interface of the reduced crystal. The defect distribution shows a strong dependence on oxygen vacancy concentration and diffusion within the crystals.

AB - Strontium titanate, SrTiO3, has been intensively investigated as a model material in defect chemistry research. The underlying mechanism of the effects associated with a large variety of defects often requires microstructure imaging. In the present work, the distribution of nanoscale structural defects in electrodegraded Fe-doped SrTiO3 (Fe:STO) single crystals is directly revealed by ultrafast photoacoustic waves. We utilized time-resolved reflectance spectra to nondestructively characterize local structural distortions near the degraded anode and cathode interfaces in both the reduced and oxidized crystals along with transmission electron microscopy to image these defects. We show that an accumulation of oxygen vacancies resulted in significant structural deformations near the degraded cathode interface of the reduced crystal. The defect distribution shows a strong dependence on oxygen vacancy concentration and diffusion within the crystals.

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JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 24

ER -

Detection of Nanoscale Structural Defects in Degraded Fe-Doped SrTiO₃ by Ultrafast Photoacoustic Waves

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