Growth rate effect on microstructure and thermoelectric properties of melt grown Bi2Ba2Co2Ox textured ceramics

被引：36

作者：

Rasekh, Sh. ^{[1
]}

Constantinescu, G. ^{[1
]}

Torres, M. A. ^{[2
]}

Madre, M. A. ^{[1
]}

Diez, J. C. ^{[1
]}

Sotelo, A. ^{[1
]}

机构：

[1] Univ Zaragoza, Inst Ciencia Mat Aragon, CSIC, Zaragoza 50018, Spain

[2] Univ Zaragoza, Dept Ingn Diseno & Fabricac, Zaragoza 50018, Spain

来源：

ADVANCES IN APPLIED CERAMICS | 2012年 / 111卷 / 08期

关键词：

Ceramics; Oxides; Misfit cobaltites; Texturing; Thermopower; Electrical properties; Crystal growth; LAYERED COBALTITES; MISFIT COBALTITES; BI SUBSTITUTION; MAGNETORESISTANCE; CA3CO4O9; OXIDES; POWER; SR; PB;

D O I：

10.1179/1743676112Y.0000000039

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Bi2Ba2Co2Ox thermoelectric (TE) ceramics have been grown from the melt using the laser floating zone method at different growth rates (15, 30 and 90 mm h(-1)). Microstructural analysis has shown an improvement of the grain alignment and a reduction of secondary phases when the growth speed is decreased. These microstructural features have been reflected in the TE performances, with a reduction of the electrical resistivity and, as a consequence, at significant increase in the power factor values, reaching similar to 0.15 mW K-2 m(-1) at 650 degrees C for the samples grown at 15 mm h(-1), which is much higher than the typical values obtained in these materials.

引用

页码：490 / 494

页数：5

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