Synthesis and high thermoelectric efficiency of Zintl phase YbCd2−xZnxSb2
Synthesis and high thermoelectric efficiency of Zintl phase YbCd2−xZnxSb2
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DOI：
10.1063/1.3040321
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发表时间：
2009-03
影响因子：
4
通讯作者：
Xiao-jun Wang;M. Tang;Hao Chen;Xinxin Yang;Jingtai Zhao;U. Burkhardt;Y. Grin
中科院分区：
文献类型：
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作者：
Xiao-jun Wang;M. Tang;Hao Chen;Xinxin Yang;Jingtai Zhao;U. Burkhardt;Y. Grin
合成了一系列多晶YbCd_2-−_xZn_xSb_2(x=0，0.4，0.8，1，1.2，1.6和2)样品，并对其热电性能进行了测试。对于富Cd样品(x=0、0.4、0.8和1.0)，700K时的热电优值系数ZT大于1.0，并且Cd在YbCd2Sb2中的锌替代可以很容易地调节载流子浓度，降低热导率。当x=0.4时，样品表现出最高的功率因数(12-20μWcm−1K−2)，最低的晶格热导率(300K时为1.0Wm−1K−1)，最高的ZT(700K时为1.2)，以及最佳的“自兼容性”。用第一性原理计算研究了成键结构和电子结构对物理性质的影响。
We synthesized a series of polycrystalline YbCd2−xZnxSb2 (x=0, 0.4, 0.8, 1, 1.2, 1.6, and 2) samples and measured their thermoelectric properties. Thermoelectric figure of merit ZT at 700K is higher than 1.0 for Cd-rich samples (x=0, 0.4, 0.8, and 1.0) and Zn substitute of Cd in YbCd2Sb2 can easily tune carrier concentration and reduce thermal conductivity. When x=0.4, sample exhibits the highest power factor (12–20μWcm−1K−2), the lowest lattice thermal conductivity (1.0Wm−1K−1 at 300K), highest ZT (1.2 at 700K), and best “self-compatibility.” The first principles calculations were performed to study the influences of bonding and electronic structures on physical properties.