Transport properties of Zintl phase Yb1-xCaxCd2Sb2 at low temperature
来源期刊：JOURNAL OF RARE EARTHS2010年第3期
论文作者：操齐高 汤美波 马光 陈昊鸿 杨昕昕 赵景泰
文章页码：403 - 406
摘 要：We investigated the transport properties of isoelectronic substitution of Yb by Ca for Zintl phase YbCd2Sb2 below 300 K.The p-type Yb1-xCaxCd2Sb2（0.2≤x≤0.8） samples were synthesized via a solid-state reaction followed by suitable cooling,annealing,grinding,and spark plasma sintering（SPS） densification processes.For samples with x=0.2,0.4,0.5,0.6,0.8,the electrical conductivity,Seebeck coefficient,thermal conductivity,heat capacity and Hall effect measurements were carried out in the temperature range from 1.9 to 300 K.It was found that the Ca substitution effectively lowered the thermal conductivity at low temperature,while the electrical resistivity and the Seebeck coefficient in the compounds were found to increase with increasing Ca concentration.As a result,the dimensionless figure of merit ZT of 0.18 was attained at 300 K for sample with x=0.2.
操齐高1,2，汤美波1，马光3，陈昊鸿1，杨昕昕1，赵景泰1
1. Key Laboratory of Transparent Opto-Functional Inorganic Materials of Chinese Academy of Sciences,Shanghai Institute of Ceramics,Chinese Academy of Sciences2. Graduate School of Chinese Academy of Sciences3. Northwest Institute for Non-Ferrous Metal Research
摘 要：We investigated the transport properties of isoelectronic substitution of Yb by Ca for Zintl phase YbCd2Sb2 below 300 K.The p-type Yb1-xCaxCd2Sb2（0.2≤x≤0.8） samples were synthesized via a solid-state reaction followed by suitable cooling,annealing,grinding,and spark plasma sintering（SPS） densification processes.For samples with x=0.2,0.4,0.5,0.6,0.8,the electrical conductivity,Seebeck coefficient,thermal conductivity,heat capacity and Hall effect measurements were carried out in the temperature range from 1.9 to 300 K.It was found that the Ca substitution effectively lowered the thermal conductivity at low temperature,while the electrical resistivity and the Seebeck coefficient in the compounds were found to increase with increasing Ca concentration.As a result,the dimensionless figure of merit ZT of 0.18 was attained at 300 K for sample with x=0.2.
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