Intergrowth and thermoelectric properties in the Bi-Ca-Co-O system

被引：16

作者：

Luo, X. G. ^{[1
]}

Jing, Y. C. ^{[1
]}

Chen, H. ^{[1
]}

Chen, X. H. ^{[1
]}

机构：

[1] Univ Sci & Technol China, Dept Phys, Hefei Natl Lab Phys Sci & Microscale, Hefei 230026, Peoples R China

来源：

JOURNAL OF CRYSTAL GROWTH | 2007年 / 308卷 / 02期

基金：

中国国家自然科学基金;

关键词：

TEM; thermoelectric effects; XRD; flux growth; bismuth compounds; calcium compounds;

D O I：

10.1016/j.jcrysgro.2007.07.037

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Single crystals of the Bi-Ca-Co-O system have been grown using the flux method with cooling from 900 and 950 degrees C, respectively. The single crystals are characterized by transmission electron microscopy and X-ray diffraction. The misfit cobaltite [Ca2Bi1.4CO0.6O4](RS)[CoO2](1.69) single crystals with quadruple (n = 4) rocksalt (RS) layer are achieved with cooling from 900 degrees C. Such a crystal exhibits room-temperature thermoelectric power (TEP) of 180 mu V/K, much larger than that in Sr-based misfit cobaltites with quadruple RS layer. However, intergrowth of single crystals of quadruple (n = 4) and triple (n = 3) RS-type layer-based misfit cobaltites is observed with cooling from 950 degrees C. Both of TEP and resistivity were obviously enhanced by the intergrowth compared to [Ca2Bi1.4CO0.6O4](RS)[CoO2](1.69) single crystal, while the power factor at room temperature remains unchanged. (C) 2007 Published by Elsevier B.V.

引用

页码：309 / 313

页数：5

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