Thermoelectric transport properties of Bi CuSeO with embedded La0.8Sr_(0.2)CoO_3 nanoinclusions  

作　　者：LIU YaoChun LAN JinLe ZHANG BoPing LIN YuanHua NAN CeWen 

机构地区：[1]School of Materials Science and Engineering, University of Science and Technology Beijing [2]State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering,Tsinghua University [3]State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology

出　　处：《Science China(Technological Sciences)》2016年第7期1036-1041,共6页中国科学（技术科学英文版）

基　　金：supported by the National Basic Research Program of China("973"Project)(Grant No.2013CB632506);the National Natural Science Foundation of China(Grant Nos.51328203,51221291&11234012);the Specialized Research Fund for the Doctoral Program of Higher Education(Grant No.20120002110006)

摘　　要：The efficiency-upgrading role that La0.8Sr0.2CoO3 plays in the thermoelectric properties of Bi Cu Se O（BCSO） has been studied. LSCO was introduced into BCSO, increasing the electrical conductivity from 3.3 to 52.3 S cm^-1 at 303 K, from 35.8 to 97.3 S cm^-1 at 873 K; respectively. The Seebeck coefficient of all composites still holds around or more than 200 μV/K. Based on the enhanced electrical conductivity and high Seebeck coefficient, the power factor is enhanced by approximately 35%, with the best sample reaching a maximum value of 476.7 μ Wm^-1 K^-2 at 873 K. The lattice thermal conductivity of the nanocomposites is reduced as LSCO content increases from 15 vol% to 30 vol% due to the phonon scattering by nanoparticles and grain boundaries, resulting in a significant reduction in total thermal conductivity. In short, the enhanced thermoelectric figure of merit of 0.67 at 873 K for the sample containing 20 vol% LSCO as compared to 0.53 for the pure sample; announces the promising effect of LSCO on improving thermoelectric properties of Bi Cu Se O.

关 键 词：Bi Cu Se O La0.8Sr0.2CoO3 thermoelectric composite 

分 类 号：TB34[一般工业技术—材料科学与工程]