Nonlinear optical detections of structural distortions at degraded Fe-doped SrTiO3 interfaces

O. Kurt, D. Ascienzo, S. Greenbaum, T. J.M. Bayer, C. A. Randall, N. Madamopoulos, Y. H. Ren*

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13 Atıf (Scopus)

Özet

We investigate structural deformations at the interfaces of degraded Fe-doped SrTiO3 (Fe:STO) single crystals in both oxidized and reduced forms by using optical second harmonic generation (SHG) with the implementation of Raman spectroscopy in reflection geometry. SHG spectra were acquired from three different regions, namely, central, inner, and outer, across the interfaces. Structural inhomogeneity was verified across the sample interfaces by variations in SHG intensity. The SHG intensity decreased when moving towards the inner region of the degraded reduced anode, and the intensity increased as moving towards the central region of the degraded oxidized anode. These observations are associated with the formation of centrosymmetric Fe4+:Ti4+-O6 octahedral structures and non-centrosymmetric Jahn-Teller distortions in the inner region of the reduced anode and the central region of the oxidized anode, respectively. These results are consistent with Raman measurements taken from the anode interfaces of both crystals, which verify concentration changes of Fe4+ and octahedral distortions across the probed regions. The accumulation of oxygen vacancies is identified across the cathode interfaces of both crystals. These structural distortions and Fe4+ concentration changes are well correlated with the migration of oxygen ions and vacancies.

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)131-136
Sayfa sayısı6
DergiMaterials Chemistry and Physics
Hacim198
DOI'lar
Yayın durumuYayınlandı - 1 Eyl 2017
Harici olarak yayınlandıEvet

Bibliyografik not

Publisher Copyright:
© 2017 Elsevier B.V.

Finansman

Research at Hunter was supported by an AFOSR (Grant No. FA9550-14-1-0179), and at PSU support is gratefully acknowledged from AFOSR (Grant No. FA9550-14-1-0067).

FinansörlerFinansör numarası
Air Force Office of Scientific ResearchFA9550-14-1-0179
Pennsylvania State UniversityFA9550-14-1-0067

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