Thermoelectric properties of layered antiferromagnetic CuCrSe2

被引：29

作者：

Tewari, Girish C. ^{[1
]}

Tripathi, T. S. ^{[2
]}

Yamauchi, Hisao ^{[1
]}

Karppinen, Maarit ^{[1
]}

机构：

[1] Aalto Univ, Dept Chem, FI-00076 Aalto, Finland

[2] Natl Univ Singapore, Dept Phys, Singapore 117542, Singapore

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2014年 / 145卷 / 1-2期

基金：

芬兰科学院;

关键词：

Inorganic compounds; Chemical synthesis; Electrical characterisation; Magnetometer; Powder diffraction; Defects; CRYSTAL-STRUCTURES; POWER; EFFICIENCY; SELENIDES; DISORDER; SULFIDES; INCREASE; SE;

D O I：

10.1016/j.matchemphys.2014.01.053

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Here we study thermoelectric and magnetic properties of CuCrSe2 samples sintered at various temperatures. Structural analysis with XRD shows an order-disorder transition for Cr atoms when the sintering temperature is increased above 1273 K. Metal-like electrical resistivity and anomalously large Seebeck coefficient are found about room temperature. Analysis of electrical conductivity and Seebeck coefficient of the partially-disordered phase suggests hopping conduction of charge carriers. For both the ordered and disordered phases magnetic susceptibility follows Curie Weiss temperature dependence at high temperatures above 150 K and shows an antiferromagnetic transition around 55 K. For the disordered phase, the effective magnetic moment is determined at 3.62 mu(B); this low value in comparison to the spin only value for Cr3+ of 3.89 mu(B) indicates spin fluctuations in the paramagnetic state. The thermal conductivity in these phases is low and dominated by the lattice contribution. Values for the thermoelectric figure of merit (ZT) at room temperature are estimated to be 0.17 and 0.05 for the ordered and disordered phases, respectively. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：156 / 161

页数：6

共 25 条

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