Ultrafast Atomic Layer-by-Layer Oxygen Vacancy-Exchange Diffusion in Double-Perovskite LnBaCo2O5.5+δ Thin Films

被引：46

作者：

Bao, Shanyong ^{[1
,2
]}

Ma, Chunrui ^{[1
]}

Chen, Garry ^{[1
]}

Xu, Xing ^{[1
]}

Enriquez, Erik ^{[1
]}

Chen, Chonglin ^{[1
,3
]}

Zhang, Yamei ^{[4
]}

Bettis, Jerry L., Jr. ^{[5
]}

Whangbo, Myung-Hwan ^{[5
]}

Dong, Chuang ^{[2
]}

Zhang, Qingyu ^{[2
]}

机构：

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

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

[3] Univ Houston, Texas Ctr Superconduct, Houston, TX 77204 USA

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

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

来源：

SCIENTIFIC REPORTS | 2014年 / 4卷

基金：

美国国家科学基金会;

关键词：

TRANSPORT-PROPERTIES; ION DIFFUSION;

D O I：

10.1038/srep04726

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Surface exchange and oxygen vacancy diffusion dynamics were studied in double-perovskites LnBaCo(2)O(5.5+delta) (LnBCO) single-crystalline thin films (Ln = Er, Pr;-0.5 <delta < 0.5) by carefully monitoring the resistance changes under a switching flow of oxidizing gas (O-2) and reducing gas (H-2) in the temperature range of 250 similar to 800 degrees C. A giant resistance change Delta R by three to four orders of magnitude in less than 0.1 s was found with a fast oscillation behavior in the resistance change rates in the Delta R vs. t plots, suggesting that the oxygen vacancy exchange diffusion with oxygen/hydrogen atoms in the LnBCO thin films is taking the layer by layer oxygen-vacancy-exchange mechanism. The first principles density functional theory calculations indicate that hydrogen atoms are present in LnBCO as bound to oxygen forming O-H bonds. This unprecedented oscillation phenomenon provides the first direct experimental evidence of the layer by layer oxygen vacancy exchange diffusion mechanism.

引用

页数：5

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