Preparation of sintered degenerate n-type PbTe with a small grain size and its thermoelectric properties
Preparation of sintered degenerate n-type PbTe with a small grain size and its thermoelectric properties
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DOI：
10.1063/1.1499206
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发表时间：
2002-09-01
影响因子：
3.2
通讯作者：
Koyanagi, T
中科院分区：
文献类型：
--
作者：
Kishimoto, K;Koyanagi, T
烧结简并n型PbTe样品的晶粒尺寸从0.7到4微米的范围内制备和晶粒尺寸对它们的热电性能的影响，然后进行了研究。当晶粒尺寸从4 μ m减小到0.7 μ m时，烧结样品的塞贝克系数几乎增加了一倍。另一方面，它们的电导率和热导率随着晶粒尺寸的减小而减小。因此，减小它们的晶粒尺寸增加了它们的热电优值。所获得的小晶粒尺寸样品的品质因数的最大值是显着高于大晶粒尺寸的样品具有相同的载流子浓度的报告。这一有利的结果主要是由于塞贝克系数的增加。讨论了晶界对Seebeck系数增加的影响。可以得出结论，塞贝克系数增加的势垒散射，这发生在烧结样品的晶界。(C)2002年美国物理学会。
Sintered degenerate n-type PbTe samples with small grain sizes ranging from 0.7 to 4 mum were prepared and the effects of grain size on their thermoelectric properties were then investigated. The Seebeck coefficient of the sintered samples increased almost double when the grain size decreased from 4 to 0.7 mum. On the other hand, their electrical and thermal conductivity decreased with decreasing grain size. Accordingly, decreasing their grain size increased their thermoelectric figure-of-merit. A maximum value of the figure-of-merit of the obtained small grain-size samples was significantly higher than that of large grain-size samples with the same carrier concentration reported. This favorable result was caused mainly by the increase in the Seebeck coefficient. The influences of grain boundaries on the increase in the Seebeck coefficient were discussed. It is concluded that the Seebeck coefficient was increased by potential barrier scattering, which occurred at the grain boundaries in the sintered samples. (C) 2002 American Institute of Physics.