(001)-oriented Bi2Sr2Co2Oy and Ca3Co4O9 films: Self-assembly orientation and growth mechanism by chemical solution deposition

被引：49

作者：

Zhu, Xuebin ^{[1
,2
]}

Shi, Dongqi ^{[2
]}

Dou, Shixue ^{[2
]}

Sun, Yuping ^{[1
]}

Li, Qi ^{[2
]}

Wang, Lin ^{[2
]}

Li, Wenxian ^{[2
]}

Yeoh, Weikong ^{[3
]}

Zheng, Rongkun ^{[3
]}

Chen, Zhixin ^{[4
]}

Kong, Chunxiu ^{[5
]}

机构：

[1] Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Peoples R China

[2] Univ Wollongong, Inst Superconducting & Elect Mat, Wollongong, NSW 2522, Australia

[3] Univ Sydney, Australian Key Ctr Microscopy & Microanal, Sydney, NSW 2006, Australia

[4] Univ Wollongong, Sch Mech Mat & Mechatron Engn, Wollongong, NSW 2522, Australia

[5] Univ New S Wales, Electron Microscope Unit, Sydney, NSW 2052, Australia

来源：

ACTA MATERIALIA | 2010年 / 58卷 / 12期

基金：

中国国家自然科学基金;

关键词：

Self-assembly; Thermoelectric; Film; Chemical solution deposition; TEMPERATURE TRANSPORT-PROPERTIES; THERMOELECTRIC PROPERTIES; LAYERED COBALTITE; THIN-FILMS; TEXTURE; MICROSTRUCTURE; OXIDES;

D O I：

10.1016/j.actamat.2010.04.021

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this study, two typical cobaltate-based thermoelectric films, Bi2Sr2Co2Oy (BSC) and Ca3Co4O9 (CCO), with structures of [Bi2Sr2O4][CoO2](2) and [Ca2CoO3](Rs)[CoO2], respectively, are prepared by a simple chemical solution deposition on SrTiO3 (1 0 0), (1 1 0), and (1 1 1) single crystal substrates. X-ray results reveal that all films are c-axis oriented regardless of the orientation of the substrate, suggesting self-assembly orientation. Transmission electron microscopy reveals amorphous/delamination regions for BSC film on SrTiO3 (1 1 0), and the c-axis stripes of CCO on SrTiO3 (1 1 1) are inclined at 30 degrees to the interface, whereas the c-axis stripes are parallel to the interfaces for other films. The growth mechanism is established, and the driving force for self-assembly c-axis orientation is attributed to the syneresis stress due to solvent evaporation. The microstructures and properties are also studied and discussed, with the conclusion that self-assembly c-axis oriented layered cobaltates films are good candidates for thermoelectric applications. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：4281 / 4291

页数：11

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