Synthesis and high thermoelectric efficiency of Zintl phase YbCd2-xZnxSb2

Xiao-Jun Wang; Mei-Bo Tang; Hao-Hong Chen; Xin-Xin Yang; Jing-Tai Zhao; Burkhardt, Ulrich; Yuri Grin
March 2009
Applied Physics Letters;3/2/2009, Vol. 94 Issue 9, pN.PAG
Academic Journal
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 700 K 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 (12–20 μW cm-1 K-2), the lowest lattice thermal conductivity (1.0 W m-1 K-1 at 300 K), highest ZT (1.2 at 700 K), and best “self-compatibility.” The first principles calculations were performed to study the influences of bonding and electronic structures on physical properties.


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