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Thermoelectric Properties of Polycrystalline SrZn2Sb2 Prepared by Spark Plasma Sintering
Authors:Hui Zhang  Mei-Bo Tang  Walter Schnelle  Michael Baitinger  Zhen-Yong Man  Hao-Hong Chen  Xin-Xin Yang  Jing-Tai Zhao  Yuri Grin
Affiliation:1. Key Laboratory of Transparent Opto-Functional Inorganic Materials, Chinese Academy of Sciences (Shanghai Institute of Ceramics), 200050, Shanghai, China
2. Max-Planck-Institut für Chemische Physik fester Stoffe, N?thnitzer Str. 40, 01187, Dresden, Germany
Abstract:Compact polycrystalline samples of SrZn2Sb2 [space group $ Poverline{3} m1 $ , a = 4.503(1) Å, c = 7.721(1) Å] were prepared by spark plasma sintering. Thermoelectric performance, Hall effect, and magnetic properties were investigated in the temperature range from 2 K to 650 K. The thermoelectric figure of merit ZT was found to increase with temperature up to ZT = 0.15 at 650 K. At this temperature the material showed a high Seebeck coefficient of +230 μV K?1, low thermal conductivity of 1.3 W m?1 K?1, but rather low electrical conductivity of 54 S cm?1, together with a complex temperature behavior. SrZn2Sb2 is a diamagnetic p-type conductor with a carrier concentration of 5 × 1018 cm?3 at 300 K. The electronic structure was calculated within the density-functional theory (DFT), revealing a low density of states (DOS) of 0.43 states eV?1 cell?1 at the Fermi level.
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