Effect of manganese doping on the thermoelectric properties of Zintl phase EuCd_2Sb_2  

作　　者：闵武茂 郭凯 王继伟 赵景泰 

机构地区：[1]Key Laboratory of Transparent Opto-Functional Inorganic Materials of Chinese Academy of Sciences, Shanghai Institute of Ceramics, Chinese Academy of Sciences [2]University of Chinese Academy of Sciences [3]School of Materials Science and Engineering, Shanghai University [4]Shanghai Advanced Research Institute, Chinese Academy of Sciences

出　　处：《Journal of Rare Earths》2015年第10期1093-1097,共5页稀土学报（英文版）

基　　金：Project supported by Young Eastern Scholar Project of Shanghai Municipal Education Commission(QD2015031)

摘　　要：Polycrystalline samples of Zintl phase EuCd2-xMnxSb2 （0.05≤x≤0.6） with the CaAl2Si2-type crystal structure （space group P3ml） were synthesized via a solid-state reaction followed by suitable cooling, annealing and spark plasma sintering （SPS） processes. In samples with x=0.0, 0.1, 0.2, 0.4 and 0.6, the electrical conductivity, Seebeck coefficient, and thermal conductivity were performed as a function of temperature from 300 to 650 K. It was found that chemical substitution of Mn failed to optimize the thermoelectric properties of p-type conductive EuCd2Sb2. It was because that the Mn substitution induced the minority carriers （electrons）, resulting in decreasing the electrical conductivity drastically despite the fact that it enlarged the Seebeck coefficient and reduced the thermal conductivity synchronously.Polycrystalline samples of Zintl phase EuCd2-xMnxSb2 （0.05≤x≤0.6） with the CaAl2Si2-type crystal structure （space group P3ml） were synthesized via a solid-state reaction followed by suitable cooling, annealing and spark plasma sintering （SPS） processes. In samples with x=0.0, 0.1, 0.2, 0.4 and 0.6, the electrical conductivity, Seebeck coefficient, and thermal conductivity were performed as a function of temperature from 300 to 650 K. It was found that chemical substitution of Mn failed to optimize the thermoelectric properties of p-type conductive EuCd2Sb2. It was because that the Mn substitution induced the minority carriers （electrons）, resulting in decreasing the electrical conductivity drastically despite the fact that it enlarged the Seebeck coefficient and reduced the thermal conductivity synchronously.

关 键 词：Zintl phase compounds chemical substitution solid-state reaction thermoelectric properties rare earths 

分 类 号：TB34[一般工业技术—材料科学与工程]