Atomically layer-by-layer diffusion of oxygen/hydrogen in highly epitaxial PrBaCo2O5.5+δ thin films

被引：12

作者：

Bao, Shanyong ^{[1
]}

Xu, Xing ^{[1
]}

Enriquez, Erik ^{[1
]}

Mace, Brennan E. ^{[1
]}

Chen, Garry ^{[1
]}

Kelliher, Sean P. ^{[1
]}

Chen, Chonglin ^{[1
]}

Zhang, Yamei ^{[2
]}

Whangbo, Myung-Hwan ^{[3
]}

Dong, Chuang ^{[4
]}

Zhang, Qinyu ^{[4
]}

机构：

[1] Univ Texas San Antonio, Dept Phys & Astron, San Antonio, TX 78249 USA

[2] Jiangsu Univ Sci & Technol, Dept Phys, Zhenjiang 212003, Jiangsu, Peoples R China

[3] N Carolina State Univ, Raleigh, NC 27695 USA

[4] Dalian Univ Technol, Key Lab Mat Modificat Laser Ion & Electron Beams, Minist Educ, Dalian 116024, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2015年 / 107卷 / 24期

关键词：

OXYGEN DIFFUSION; PEROVSKITES;

D O I：

10.1063/1.4937926

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Single-crystalline epitaxial thin films of PrBaCo2O5.5+delta (PrBCO) were prepared, and their resistance R(t) under a switching flow of oxidizing and reducing gases were measured as a function of the gas flow time t in the temperature range of 200-800 degrees C. During the oxidation cycle under O-2, the PrBCO films exhibit fast oscillations in their dR(t)/dt vs. t plots, which reflect the oxidation processes, Co2+/Co3+ -> Co3+ and Co3+ -> Co3+/Co4+, that the Co atoms of PrBCO undergo. Each oscillation consists of two peaks, with larger and smaller peaks representing the oxygen/hydrogen diffusion through the (BaO)(CoO2)(PrO)(CoO2) layers of PrBCO via the oxygen-vacancy-exchange mechanism. This finding paves a significant avenue for cathode materials operating in low-temperature solid-oxide-fuel-cell devices and for chemical sensors with wide range of operating temperature. (C) 2015 AIP Publishing LLC.

引用

页数：5

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