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

• 作 者: 闵武茂 郭凯 王继伟 赵景泰
• 机 构: Key Laboratory of Transparent Opto-Functional Inorganic Materials of Chinese Academy of Sciences, Sh
• 出 处: Journal of Rare Earths
• 发表日期: 2015年10期
• 关键词: Zintl phase compounds chemical substitution solid-state reaction thermoelectric

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.

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.