Brownmillerite phase formation and evolution in epitaxial strontium ferrite heterostructures

Le Wang; Zhenzhong Yang; Mark E. Bowden; Yingge Du

doi:10.1063/1.5096769

Brownmillerite phase formation and evolution in epitaxial strontium ferrite heterostructures

Le Wang, Zhenzhong Yang, Mark E. Bowden, Yingge Du

Research output: Contribution to journal › Article › peer-review

34 Scopus citations

Abstract

By controlling the synthesis and process conditions, we show that the oxygen vacancy channels (OVCs) of brownmillerite-structured SrFeO_2.5+δ (0 ≤ δ< 0.5) thin films can be oriented differently on the same LaAlO₃(001) substrate due to either a bottom up or top down synthesis route. The dynamic brownmillerite structure formation and evolution processes yield distinctively different optical and electronic properties, owing to the difference in both the oxygen stoichiometry and the OVC configuration in the resultant films. With the established recipe, we generated insulating SrFeO_2.5 with vertically aligned OVCs and metallic SrFeO₃ standards so that the other intermediate states can be directly compared and understood. Our results offer further insight into the phase stability and oxygen-diffusion mechanisms, which is important for the predictive synthesis of novel functional materials.

Original language	English
Article number	231602
Journal	Applied Physics Letters
Volume	114
Issue number	23
DOIs	https://doi.org/10.1063/1.5096769
State	Published - 10 Jun 2019
Externally published	Yes

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title = "Brownmillerite phase formation and evolution in epitaxial strontium ferrite heterostructures",

abstract = "By controlling the synthesis and process conditions, we show that the oxygen vacancy channels (OVCs) of brownmillerite-structured SrFeO2.5+δ (0 ≤ δ< 0.5) thin films can be oriented differently on the same LaAlO3(001) substrate due to either a bottom up or top down synthesis route. The dynamic brownmillerite structure formation and evolution processes yield distinctively different optical and electronic properties, owing to the difference in both the oxygen stoichiometry and the OVC configuration in the resultant films. With the established recipe, we generated insulating SrFeO2.5 with vertically aligned OVCs and metallic SrFeO3 standards so that the other intermediate states can be directly compared and understood. Our results offer further insight into the phase stability and oxygen-diffusion mechanisms, which is important for the predictive synthesis of novel functional materials.",

author = "Le Wang and Zhenzhong Yang and Bowden, \{Mark E.\} and Yingge Du",

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doi = "10.1063/1.5096769",

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TY - JOUR

T1 - Brownmillerite phase formation and evolution in epitaxial strontium ferrite heterostructures

AU - Wang, Le

AU - Yang, Zhenzhong

AU - Bowden, Mark E.

AU - Du, Yingge

PY - 2019/6/10

Y1 - 2019/6/10

N2 - By controlling the synthesis and process conditions, we show that the oxygen vacancy channels (OVCs) of brownmillerite-structured SrFeO2.5+δ (0 ≤ δ< 0.5) thin films can be oriented differently on the same LaAlO3(001) substrate due to either a bottom up or top down synthesis route. The dynamic brownmillerite structure formation and evolution processes yield distinctively different optical and electronic properties, owing to the difference in both the oxygen stoichiometry and the OVC configuration in the resultant films. With the established recipe, we generated insulating SrFeO2.5 with vertically aligned OVCs and metallic SrFeO3 standards so that the other intermediate states can be directly compared and understood. Our results offer further insight into the phase stability and oxygen-diffusion mechanisms, which is important for the predictive synthesis of novel functional materials.

AB - By controlling the synthesis and process conditions, we show that the oxygen vacancy channels (OVCs) of brownmillerite-structured SrFeO2.5+δ (0 ≤ δ< 0.5) thin films can be oriented differently on the same LaAlO3(001) substrate due to either a bottom up or top down synthesis route. The dynamic brownmillerite structure formation and evolution processes yield distinctively different optical and electronic properties, owing to the difference in both the oxygen stoichiometry and the OVC configuration in the resultant films. With the established recipe, we generated insulating SrFeO2.5 with vertically aligned OVCs and metallic SrFeO3 standards so that the other intermediate states can be directly compared and understood. Our results offer further insight into the phase stability and oxygen-diffusion mechanisms, which is important for the predictive synthesis of novel functional materials.

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U2 - 10.1063/1.5096769

DO - 10.1063/1.5096769

M3 - 文章

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SN - 0003-6951

VL - 114

JO - Applied Physics Letters

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ER -

Brownmillerite phase formation and evolution in epitaxial strontium ferrite heterostructures

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