Effect of manganese doping on the thermoelectric properties of Zintl phase EuCd2Sb2

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,...

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Published inJournal of rare earths Vol. 33; no. 10; pp. 1093 - 1097
Main Author 闵武茂 郭凯 王继伟 赵景泰
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.10.2015
Subjects
chemical substitution
rare earths
Seebeck系数
solid-state reaction
thermoelectric properties
Zintl phase compounds
固相反应合成
多晶样品
少数载流子
放电等离子烧结
晶体结构
热电性能
锰掺杂
chemical substitution
solid-state reaction
Zintl phase compounds
thermoelectric properties
rare earths
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ISSN1002-0721
2509-4963
DOI10.1016/S1002-0721(14)60531-7

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Summary: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.
Bibliography:11-2788/TF
MIN Wumao, GUO Kai, WANG Jiwei ZHAO Jingtai （1. Key Laboratory of Transparent Opto-Functional Inorganic Materials of Chinese Academy of Sciences, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China 2. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China; 3. University of Chinese Academy of Sciences, Beijing 100049, China 4. Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China）
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.
Zintl phase compounds; chemical substitution; solid-state reaction; thermoelectric properties; rare earths
ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(14)60531-7