The Oxygen Partial Pressure Dependence of Space Charges at SrTiO₃|Mixed Ionic Electronic Conducting Oxide Heterojunctions.

IF 10.7 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Small Methods Pub Date : 2025-06-11 DOI:10.1002/smtd.202500728

Claudia Steinbach, Alexander Schmid, Tobias M Huber, Juergen Fleig

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引用次数: 0

Abstract

The electrical and electrochemical properties of mixed conducting oxides often depend on the oxygen partial pressure p(O₂) and numerous studies have dealt with the p(O₂) dependencies found in bulk materials. However, measurements regarding the properties of interfaces between two different mixed conducting oxides are much less common. This work investigates the interfacial space charge region in SrTiO₃ (STO) caused by the contact with another mixed ionic and electronic conductor (MIEC), specifically La_0.6Sr_0.4FeO_3-δ (LSF), La_0.65Sr_0.35MnO_3-δ (LSM) and La_0.9Sr_0.1CrO_3-δ (LSCr). The space charge regions were investigated by means of electrochemical impedance spectroscopy at 500 °C in the broad p(O₂) range of 1 bar to 10^-32 bar. All measurable space charge potentials Δϕ show a decrease with decreasing p(O₂). A model correlates the change in Δϕ with the strongly p(O₂) dependent defect concentrations of the MIECs. The measured partial pressure dependencies of Δϕ can be fully attributed to the different p(O₂) dependencies of the respective bulk Fermi levels. The suggested model is broadly applicable to MIEC|MIEC interfaces in general and can also be used to predict transitions of space charges from hole depleted to electron depleted layers.

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SrTiO3|混合离子电子导电氧化物异质结中空间电荷的氧分压依赖性。

混合导电氧化物的电学和电化学性能通常取决于氧分压p(O2)，许多研究已经处理了在块状材料中发现的p（O2）依赖性。然而，关于两种不同的混合导电氧化物之间的界面性质的测量要少得多。本文研究了SrTiO3 （STO）与另一种混合离子和电子导体（MIEC），即La0.6Sr0.4FeO3-δ (LSF), La0.65Sr0.35MnO3-δ (LSM)和La0.9Sr0.1CrO3-δ (LSCr)接触引起的界面空间电荷区域。在p（O2）范围为1 ~ 10 ~ 32 bar的500℃条件下，用电化学阻抗谱研究了空间电荷区。所有可测空间电荷电位Δϕ均随p（O2）的减小而减小。一个模型将Δϕ的变化与强烈依赖于p（O2）的miec缺陷浓度联系起来。测得的Δϕ的分压依赖关系可以完全归因于各自体费米能级的不同p（O2）依赖关系。所提出的模型广泛适用于一般的MIEC|MIEC界面，也可用于预测空间电荷从空穴耗尽层到电子耗尽层的转变。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Small Methods Materials Science-General Materials Science

CiteScore

17.40

自引率

1.60%

发文量

347

期刊介绍： Small Methods is a multidisciplinary journal that publishes groundbreaking research on methods relevant to nano- and microscale research. It welcomes contributions from the fields of materials science, biomedical science, chemistry, and physics, showcasing the latest advancements in experimental techniques. With a notable 2022 Impact Factor of 12.4 (Journal Citation Reports, Clarivate Analytics, 2023), Small Methods is recognized for its significant impact on the scientific community. The online ISSN for Small Methods is 2366-9608.