Formation of structural defects and strain in electrodegraded Fe-doped SrTiO3 crystals due to oxygen vacancy migration

David Ascienzo, Onur Kurt, Steve Greenbaum, Thorsten J.M. Bayer, Russell A. Maier, Clive A. Randall, Yuhang Ren

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We report on our investigation of structural defect and strain formation in electrodegraded reduced and oxidized, Fe-doped SrTiO3 (Fe:STO) single crystals using optical second harmonic generation (SHG) and confocal Raman spectroscopy. SHG and Raman spectra reveal structural and electrochemical inhomogeneity resulting from the formation of Fe4+/oxygen ion and Fe3+/oxygen vacancy aggregation sites along the degraded anode and cathode interfaces, respectively. We show that mixed Fe3+/Fe4+ states and structural strain gradients are generated across the color fronts. These results, as well as oxygen sublattice differences between the anodic and cathodic bulk, present the color front as an interface between two dominant oxygen bonding distortions. The strain near the color front shows a strong dependence on oxygen vacancy concentration and diffusion within the crystals. Our characterization of structural and electrochemical changes due to electric field-induced strain and oxygen vacancy migration advances knowledge of electrodegradation in perovskite-based titanate single crystals.

Original languageEnglish (US)
Pages (from-to)2545-2561
Number of pages17
JournalJournal of the American Ceramic Society
Volume101
Issue number6
DOIs
StatePublished - Jun 2018

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Oxygen vacancies
defect
crystal
Defects
oxygen
Crystals
Harmonic generation
Oxygen
Color
Single crystals
Perovskite
Raman spectroscopy
titanate
Raman scattering
Anodes
Cathodes
Agglomeration
Electric fields
perovskite
Ions

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Ascienzo, David ; Kurt, Onur ; Greenbaum, Steve ; Bayer, Thorsten J.M. ; Maier, Russell A. ; Randall, Clive A. ; Ren, Yuhang. / Formation of structural defects and strain in electrodegraded Fe-doped SrTiO3 crystals due to oxygen vacancy migration. In: Journal of the American Ceramic Society. 2018 ; Vol. 101, No. 6. pp. 2545-2561.
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Formation of structural defects and strain in electrodegraded Fe-doped SrTiO3 crystals due to oxygen vacancy migration. / Ascienzo, David; Kurt, Onur; Greenbaum, Steve; Bayer, Thorsten J.M.; Maier, Russell A.; Randall, Clive A.; Ren, Yuhang.

In: Journal of the American Ceramic Society, Vol. 101, No. 6, 06.2018, p. 2545-2561.

Research output: Contribution to journalArticle

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AU - Ascienzo, David

AU - Kurt, Onur

AU - Greenbaum, Steve

AU - Bayer, Thorsten J.M.

AU - Maier, Russell A.

AU - Randall, Clive A.

AU - Ren, Yuhang

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AB - We report on our investigation of structural defect and strain formation in electrodegraded reduced and oxidized, Fe-doped SrTiO3 (Fe:STO) single crystals using optical second harmonic generation (SHG) and confocal Raman spectroscopy. SHG and Raman spectra reveal structural and electrochemical inhomogeneity resulting from the formation of Fe4+/oxygen ion and Fe3+/oxygen vacancy aggregation sites along the degraded anode and cathode interfaces, respectively. We show that mixed Fe3+/Fe4+ states and structural strain gradients are generated across the color fronts. These results, as well as oxygen sublattice differences between the anodic and cathodic bulk, present the color front as an interface between two dominant oxygen bonding distortions. The strain near the color front shows a strong dependence on oxygen vacancy concentration and diffusion within the crystals. Our characterization of structural and electrochemical changes due to electric field-induced strain and oxygen vacancy migration advances knowledge of electrodegradation in perovskite-based titanate single crystals.

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