Effect of Composition on Thermoelectric Properties in PbTe-Bi2Te3 Composites
Effect of Composition on Thermoelectric Properties in PbTe-Bi2Te3 Composites
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DOI：
10.1007/s11664-010-1485-9
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发表时间：
2011-01
影响因子：
2.1
通讯作者：
Ju-Hyuk Yim;Kyooho Jung;Hyo-Jung Kim;Hyung‐Ho Park;Chan Park;Jinsang Kim
中科院分区：
文献类型：
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作者：
Ju-Hyuk Yim;Kyooho Jung;Hyo-Jung Kim;Hyung‐Ho Park;Chan Park;Jinsang Kim
研究了Bi_2Te_3-PbTe赝二元系非共晶和近共晶成分合金的凝固组织和热电性能。由于相分离和亚稳三元相的存在，清晰地观察到树枝状和层状结构。在该系统中，观察到三个不同组成的相：二元Bi 2 Te 3，PbTe，和亚稳态PbBi 2 Te 4。测量了三元合金和二元化合物的塞贝克系数、电阻率和热导率。Pb-Bi-Te合金的声子热导率低于二元PbTe和Bi 2 Te 3，这可能是由于亚稳三元相的存在增加了相间的界面面积，导致相分离所致。
The solidification of alloys in the Bi2Te3-PbTe pseudobinary system at off- and near-eutectic compositions was investigated for their microstructure and thermoelectric properties. Dendritic and lamellar structures were clearly observed due to the phase separation and the existence of a metastable ternary phase. In this system, three phases with different compositions were observed: binary Bi2Te3, PbTe, and metastable PbBi2Te4. The Seebeck coefficient, electrical resistivity, and thermal conductivity of ternary alloys as well as binary compounds were measured. The phonon thermal conductivities of Pb-Bi-Te alloys were lower than those in binary PbTe and Bi2Te3, which could have resulted from the increased interfacial area between phases due to the existence of the metastable ternary phase and the resultant phase separation.