Thermoelectric properties and nanostructuring in the p-type materials NaPb 18-xSn xMTe 20 (M = Sb, Bi)
Thermoelectric properties and nanostructuring in the p-type materials NaPb 18-xSn xMTe 20 (M = Sb, Bi)
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DOI：
10.1021/cm803519p
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发表时间：
2009-03
影响因子：
8.6
通讯作者：
A. Guéguen;P. Poudeu;C. Li;S. Moses;C. Uher;Jiaqing He;V. Dravid;K. Paraskevopoulos;M. Kanatzidis-M
中科院分区：
文献类型：
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作者：
A. Guéguen;P. Poudeu;C. Li;S. Moses;C. Uher;Jiaqing He;V. Dravid;K. Paraskevopoulos;M. Kanatzidis-M
研究了标称成分为NaPb18−xSnxMTe20 （M = Sb, Bi）材料在300 ~ 650 K温度范围内的热电性能。NaPb18−xSnxMTe20的所有成员都具有立方岩盐（NaCl）型结构，在300 ~ 650 K范围内表现出p型电荷输运行为。锡的相对含量对材料的物理、结构和输运性能有很大影响。与pnicogen原子(M)的性质无关，随着Pb:Sn比的降低，电导率增加，而热功率降低。选定样品（如NaPb15Sn3BiTe20和NaPb13Sn5SbTe20）的霍尔效应数据显示，在室温下载流子浓度高达1 × 1020 cm−3。对比锑系和铋系的相应成员，我们发现无锡组分（x = 0）具有最高的功率因数，因此ZT最高，其中NaPb18BiTe20在670 K时达到ZT≈1.3。NaPb18−xSnxMTe20系列的总热…
The thermoelectric properties of materials with nominal compositions NaPb18−xSnxMTe20 (M = Sb, Bi) were investigated in the temperature range 300−650 K. All the members of NaPb18−xSnxMTe20 have a cubic rock-salt (NaCl) type structure and exhibit p-type charge transport behavior between 300−650 K. The relative fraction of Sn strongly affects the physical, structural, and transport properties of the materials. Independent of the nature of the pnicogen atom (M), the electrical conductivity increases with decreasing Pb:Sn ratio, whereas the thermopower decreases. Hall effect data for selected samples, e.g., NaPb15Sn3BiTe20 and NaPb13Sn5SbTe20, show high carrier concentrations of ∼1 × 1020 cm−3 at room temperature. Comparing corresponding members from the antimony and bismuth series, we observed that the Sn-free compositions (x = 0) exhibit the highest power factors, and as a consequence, the highest ZT, with NaPb18BiTe20 reaching a ZT ≈ 1.3 at 670 K. The NaPb18−xSnxMTe20 series exhibit increasing total therma...