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Preparation and thermoelectric properties of ternary rare earth sulfide γ-Ce3–xEuxS4

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【作者】 袁海滨； 张剑辉； 余瑞金； 苏锵；

【Author】 YUAN Haibin 1,2, ZHANG Jianhui 1, YU Ruijin1, SU Qiang 1 (1. MOE Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, China; 2. Institute of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China)

【机构】 MOE Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-Sen University； Institute of Materials Science and Engineering, Henan Polytechnic University；

【摘要】 <正>The effect of Eu-substitution on the density and thermoelectric properties of ternary sulfide Ce3–xEuxS4 (0≤x≤0.8) compacts was investigated. Ce3–xEuxS4 powders were prepared via the sulfurization of the oxide using CS2 gas at 1473 K. The pressureless sintered Ce3–xEuxS4 compacts in the atmosphere were crystallized in the γ-phase. The density of the Ce3–xEuxS4 compacts increased with the increas-ing of Eu-substitution. Eu-substitution yielded a higher Seebeck coefficient and lower electrical resistivity. The highest value of the thermoe-lectric power factor of 1.41×10–4 W/K2m was obtained for the Ce2.2Eu0.8S4 compact at 673 K. It indicated that Eu-substitution was effective for improving thermoelectric properties of Ce3–xEuxS4.

【Abstract】 The effect of Eu-substitution on the density and thermoelectric properties of ternary sulfide Ce3–xEuxS4 (0≤x≤0.8) compacts was investigated. Ce3–xEuxS4 powders were prepared via the sulfurization of the oxide using CS2 gas at 1473 K. The pressureless sintered Ce3–xEuxS4 compacts in the atmosphere were crystallized in the γ-phase. The density of the Ce3–xEuxS4 compacts increased with the increas-ing of Eu-substitution. Eu-substitution yielded a higher Seebeck coefficient and lower electrical resistivity. The highest value of the thermoe-lectric power factor of 1.41×10–4 W/K2m was obtained for the Ce2.2Eu0.8S4 compact at 673 K. It indicated that Eu-substitution was effective for improving thermoelectric properties of Ce3–xEuxS4.

【关键词】 Ce3–xEuxS4； pressureless sintering； electrical resistivity； Seebeck coefficient； thermoelectric power factors； rare earths；
【Key words】 Ce3–xEuxS4； pressureless sintering； electrical resistivity； Seebeck coefficient； thermoelectric power factors； rare earths；
【基金】 supported by the National Natural Science Foundation of China (20501023);the National "863" Project Foundation of China (2004AA001340);the Nature Science Foundation of Guangdong for Doctorial Training base (5300527)
  • 【文献出处】 Journal of Rare Earths ,稀土学报(英文版) , 编辑部邮箱 ,2008年06期
  • 【分类号】TG146.45
  • 【被引频次】9
  • 【下载频次】52
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