Influence of background oxygen pressure on film properties of pulsed laser deposited Y:BaZrO3

被引：19

作者：

Bae, Kiho ^{[1
,2
]}

Jang, Dong Young ^{[1
]}

Choi, Sung Min ^{[2
]}

Kim, Byung-Kook ^{[2
]}

Lee, Jong-Ho ^{[2
]}

Son, Ji-Won ^{[2
]}

Shim, Joon Hyung ^{[1
]}

机构：

[1] Korea Univ, Sch Mech Engn, Renewable Energy Syst Lab, Seoul 136713, South Korea

[2] Korea Inst Sci & Technol, High Temp Energy Mat Res Ctr, Seoul 136791, South Korea

来源：

THIN SOLID FILMS | 2014年 / 552卷

基金：

新加坡国家研究基金会;

关键词：

Proton-conducting ceramics; Solid oxide fuel cells; Pulse-laser deposition; Yttrium-doped barium zirconate; Oxygen pressure; Transmission electron microscopy; Electrochemical impedance spectroscopy; Grain-boundary depletion; DOPED BARIUM ZIRCONATE; OXIDE FUEL-CELLS; PROTON CONDUCTION; GRAIN-BOUNDARIES; THIN-FILMS; ELECTRICAL-CONDUCTIVITY; ELECTROLYTE; IMPEDANCE; MICROSTRUCTURES; CERAMICS;

D O I：

10.1016/j.tsf.2013.12.006

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Yttrium-doped barium zirconate (Y:BaZrO3, BZY) thin films were prepared using pulsed laser deposition (PLD) on MgO substrates at 700 degrees C by varying the ambient oxygen pressure. The microstructure and electrical properties were then investigated using transmission electron microscopy and electrochemical impedance spectroscopy. Dense, well-crystallized BZY films were produced at ambient oxygen pressures (P-amb,P-o2) of <= 6.67 Pa. At P-amb,P- (2)(o) = 13.3 Pa, conical amorphous defects and porous microstructures were observed in the films. The conductivity of PLD BZY prepared at P-amb,P-o2 <= 13.3 Pa was measured to be close to that of reference polycrystalline BZY films, and the grain-boundary properties governed the overall ion conduction, with nano-grains being covered by the space charge depletion zones. At P-amb,P-o2 >= 13.3 Pa, microstructural defects significantly degraded the electrical properties. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：24 / 31

页数：8

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