TRANSPORT PROPERTIES IN MISFIT-LAYERED Ca2Co2O5 COMPOUND

被引：3

作者：

Lan, Jinle ^{[1
]}

Zhan, Bin ^{[1
]}

Lin, Yuan-Hua ^{[1
]}

Nan, Ce-Wen ^{[1
]}

Liu, Yao-Chun ^{[2
]}

机构：

[1] Tsinghua Univ, State Key Lab New Ceram & Fine Proc, Dept Mat Sci & Engn, Beijing 100084, Peoples R China

[2] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China

来源：

FUNCTIONAL MATERIALS LETTERS | 2013年 / 6卷 / 05期

关键词：

Thermoelectric; Ca2Co2O5; magnetic properties; THERMOELECTRIC PROPERTIES; SINGLE-CRYSTALS; THERMOPOWER; CA3CO4O9; OXIDES;

D O I：

10.1142/S1793604713400018

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The low temperature transport and magnetic properties were investigated in the misfit-layered Ca2Co2O5 compound. The compound exhibits incommensurate spin-density-wave (SDW) state in the d(chi)(-1)/dT curve at 20K, which is confirmed by the resistivity (rho) characterization. The resistivity shows an upturn from metallic to insulating behavior at TM-I (130 K) and strong Fermi liquid behaviors with rho similar to T-2 relation between TM-I and T*(225 K). The Seebeck coefficient shows abnormal temperature dependence at T-p (40 K), which is suggested to origin from the long order of atomic in [Ca2CoO3] sublayer and spin fluctuation of Co ions. Moreover, large Seebeck coefficient (120 mu V/K) and low thermal conductivity (2.5 W/mK) were obtained at room temperature, indicating that it is a promising p-type thermoelectric material for energy conversion.

引用

页数：4

共 22 条

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