EFFECT OF SINTERING TEMPERATURE ON THE MICROSTRUCTURE AND THERMOELECTRIC PROPERTIES OF Ca2.7Bi0.3Co4O9

被引：3

作者：

Hao, Haoshan ^{[1
,2
,3
]}

Li, Shaofeng ^{[4
]}

Zhao, Limin ^{[1
]}

Hu, Xing ^{[2
,3
]}

机构：

[1] Henan Inst Engn, Dept Math & Phys Sci, Zhengzhou 451191, Peoples R China

[2] Zhengzhou Univ, Sch Phys Engn, Zhengzhou 450052, Peoples R China

[3] Zhengzhou Univ, Phys Mat Lab, Zhengzhou 450052, Peoples R China

[4] Zhoukou Normal Univ, Dept Phys & Elect Engn, Zhoukou 466001, Peoples R China

来源：

INTERNATIONAL JOURNAL OF MODERN PHYSICS B | 2009年 / 23卷 / 18期

关键词：

Ca2.7Bi0.3Co4O9; microstructure; thermoelectric properties; OXIDE; CERAMICS; COBALTITE; POWER;

D O I：

10.1142/S0217979209052777

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Ca2.7Bi0.3Co4O9 samples have been sintered in temperature range of 1183-1243 K by conventional solid-state reaction method. XRD and SEM investigations show that c-axis-oriented structure could be formed in these samples and Lotgering factors increase with the increase of sintering temperature when it is below 1223 K, from 52% for the sample sintered at 1183 K to 86% for the sample sintered at 1223 K. Due to decomposition of Ca2.7Bi0.3Co4O9, however, the c-axis-oriented structure was destroyed in the sample sintered at 1243 K although Ca2.7Bi0.3Co4O9 phase could be recovered at the cooling stage. The size of grains in all samples increases with the increase of sintering temperature, but the relative densities are almost kept unchanged for the samples sintered at the temperature higher than 1183 K. Due to the highly textured structure, the transport properties of the sample sintered at 1223 K are anisotropic and its ZT values in the A plane are obviously larger than those along the c-axis.

引用

页码：3575 / 3585

页数：11

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