Effect of manganese doping on the thermoelectric properties of Zintl phase EuCd2Sb2
来源期刊：JOURNAL OF RARE EARTHS2015年第10期
论文作者：闵武茂 郭凯 王继伟 赵景泰
文章页码：1093 - 1097
摘 要：Polycrystalline samples of Zintl phase EuCd2–xMnxSb2（0.0￡x￡0.6） with the CaAl2Si2-type crystal structure（space group P3m1） 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.
闵武茂1,2，郭凯3，王继伟4，赵景泰3
1. Key Laboratory of Transparent Opto-Functional Inorganic Materials of Chinese Academy of Sciences, Shanghai Institute of Ceramics, Chinese Academy of Sciences2. University of Chinese Academy of Sciences3. School of Materials Science and Engineering, Shanghai University4. Shanghai Advanced Research Institute, Chinese Academy of Sciences
摘 要：Polycrystalline samples of Zintl phase EuCd2–xMnxSb2（0.0￡x￡0.6） with the CaAl2Si2-type crystal structure（space group P3m1） 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.
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