Zintl phase compounds AM2Sb2（A=Ca,Sr,Ba,Eu,Yb;M=Zn,Cd） and their substitution variants:a class of potential thermoelectric materials
来源期刊：JOURNAL OF RARE EARTHS2013年第11期
论文作者：郭凯 操齐高 赵景泰
文章页码：1029 - 1038
摘 要：Zintl phase compounds AM2Sb2（A=Ca,Sr,Ba,Eu,Yb;M=Zn,Cd）is a new class of promising thermoelectrics owing to their intrinsic features in electronic and crystal structure,such as a small or even disappeared band-gap,large density-of-states at the Fermi level,covalently bonded network of M-Sb,as well as the layered stacking by cations A2+and anionic slabs（M2Sb2）2–.In addition,the rich solid-state chemistry of Zintl phase allows structural modification and chemical substitution to adjust the fundamental transport parameters（carrier concentration,mobility,effective mass,electronic and lattice thermal conductivity）for improving the thermoelectric performance.In the present review,the recent advances in synthesis and thermoelectric characterization of title compounds AM2Sb2were presented,and the effects of alloying or substitution for sites A,M and Sb on the electrical and thermal transport were emphasized.The structural disorder yielded by the incorporation of multiple ions significantly increased the thermoelectric figure of merit mainly resulted from the reduction of thermal conductivity without disrupting the carrier transport region in substance.Therefore,alloying or substitution has been a feasible and common route utilized to enhance thermoelectric properties in these Zintl phase compounds,especially for YbZn0.4Cd1.6Sb2（ZT700 K=1.26）,EuZn1.8Cd0.2Sb2（ZT650 K=1.06）,and YbCd1.85Mn0.15Sb2（ZT650 K=1.14）.
郭凯1,2，操齐高1,3，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. Max Planck Institute for Chemical Physics of Solids,Dresden 01187, Germany3. Northwest Institute for Nonferrous Metal Research
摘 要：Zintl phase compounds AM2Sb2（A=Ca,Sr,Ba,Eu,Yb;M=Zn,Cd）is a new class of promising thermoelectrics owing to their intrinsic features in electronic and crystal structure,such as a small or even disappeared band-gap,large density-of-states at the Fermi level,covalently bonded network of M-Sb,as well as the layered stacking by cations A2+and anionic slabs（M2Sb2）2–.In addition,the rich solid-state chemistry of Zintl phase allows structural modification and chemical substitution to adjust the fundamental transport parameters（carrier concentration,mobility,effective mass,electronic and lattice thermal conductivity）for improving the thermoelectric performance.In the present review,the recent advances in synthesis and thermoelectric characterization of title compounds AM2Sb2were presented,and the effects of alloying or substitution for sites A,M and Sb on the electrical and thermal transport were emphasized.The structural disorder yielded by the incorporation of multiple ions significantly increased the thermoelectric figure of merit mainly resulted from the reduction of thermal conductivity without disrupting the carrier transport region in substance.Therefore,alloying or substitution has been a feasible and common route utilized to enhance thermoelectric properties in these Zintl phase compounds,especially for YbZn0.4Cd1.6Sb2（ZT700 K=1.26）,EuZn1.8Cd0.2Sb2（ZT650 K=1.06）,and YbCd1.85Mn0.15Sb2（ZT650 K=1.14）.
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