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*

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21 Atıf (Scopus)

Özet

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.

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)2545-2561
Sayfa sayısı17
DergiJournal of the American Ceramic Society
Hacim101
Basın numarası6
DOI'lar
Yayın durumuYayınlandı - Haz 2018
Harici olarak yayınlandıEvet

Bibliyografik not

Publisher Copyright:
© 2017 The American Ceramic Society

Finansman

Research at Hunter was supported by an AFOSR grant (grant no. FA9550-14-1-0179 and FA9550-17-1-0339). Research at PSU was supported by an AFOSR grant (grant no. FA9550-14-1-0067).

FinansörlerFinansör numarası
Air Force Office of Scientific ResearchFA9550-14-1-0067, FA9550-14-1-0179, FA9550-17-1-0339

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