Thermoelectric properties of Na-doped Zintl compound: Mg 3− x Na x Sb 2
Thermoelectric properties of Na-doped Zintl compound: Mg 3− x Na x Sb 2
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DOI：
10.1016/j.actamat.2015.04.023
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发表时间：
2015-07
期刊：
影响因子：
9.4
通讯作者：
J. Shuai;Yumei Wang;H. Kim;Zihang Liu;Jingying Sun;Shuo Chen;J. Sui;Z. Ren
中科院分区：
文献类型：
--
作者：
J. Shuai;Yumei Wang;H. Kim;Zihang Liu;Jingying Sun;Shuo Chen;J. Sui;Z. Ren
采用机械合金化结合热压工艺成功制备了Mg3− xNaxSb 2材料，研究了Na掺杂对材料热电性能的影响。在298 ~ 773 K温度范围内，用塞贝克系数、电阻率、热导率和热电优值（ZT）表征了其热电性能。输运测量表明，最佳掺杂量为1.25at.%在773 K时，Na对Mg的吸附作用使ZT达到0.6。ZT的提高归因于载流子浓度和功率因数的提高。低成本，丰富，和无毒使该材料成为一个潜在的有前途的热电材料，在低于773 K的热源发电。
Mg3−xNaxSb2has been prepared successfully by mechanical alloying plus hot pressing to investigate the effects of Na doping on the thermoelectric properties. Thermoelectric properties were characterized by the Seebeck coefficient, electrical resistivity, thermal conductivity, and thermoelectric figure of merit (ZT) from 298 to 773 K. Transport measurements reveal that an optimum doping of 1.25 at.% Na on Mg achievedZTof 0.6 at 773 K. The enhancement inZTis attributed to increased carrier concentration and power factor. The low cost, abundance, and nontoxicity makes this material a potentially promising thermoelectric material for power generation at a heat source below 773 K.