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^*

^*Bu çalışma için yazışmadan sorumlu yazar

Araştırma sonucu: Dergiye katkı › Makale › bilirkişi

9 Atıf (Scopus)

Özet

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.

Orijinal dil	İngilizce
Sayfa (başlangıç-bitiş)	12864-12868
Sayfa sayısı	5
Dergi	Journal of Physical Chemistry C
Hacim	122
Basın numarası	24
DOI'lar	https://doi.org/10.1021/acs.jpcc.8b03240
Yayın durumu	Yayınlandı - 21 Haz 2018
Harici olarak yayınlandı	Evet

Bibliyografik not

Publisher Copyright:
© 2018 American Chemical Society.

Finansman

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).

Finansörler	Finansör numarası
Air Force Office of Scientific Research	FA9550-17-1-0342, FA9550-17-1-0339
Plymouth State University	FA9550-14-1-0067

Belgeye Erişim

10.1021/acs.jpcc.8b03240

Diğer Dosyalar ve Linkler

Link to publication in Scopus

Alıntı Yap

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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

PY - 2018/6/21

Y1 - 2018/6/21

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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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