基于热电模块实验的低温下塞贝克系数的测量

Measurement of Seebeck Coefficient at Cryogenic Temperature Based on Thermoelectric Module Experiment

利用热电发电器(TEG)进行温差发电是LNG冷能利用的方式之一,而目前低温下热电材料塞贝克系数研究的缺失给低温TEG的设计带来了障碍。因此,本文提出一种通过TEG模块的实验得到低温下该模块所用热电材料(α)的测量方法,并测试了热电材料Bi_(2)Te_(3)在90~180 K温度范围内的α。结果表明:Bi_(2)Te_(3)在低温下的α随温度的降低而减小,温度从180 K降至90 K,α从124.6μV/K降至49.3μV/K,且与温度成二次函数关系。

Thermoelectric generators(TEG)is one way to utilize the cold energy of LNG.Inadequate research on the Seebeck coefficient(α)of thermoelectric materials at cryogenic temperatures has hindered the design of TEG at cryogenic temperatures.Consequently,this paper proposes a method to measureαof the thermoelectric material,Bi_(2)Te_(3),at cryogenic temperatures using a TEG module experiment,which measuresαof thermoelectric materials in the temperature range of 90 K to 180 K.The results showed thatαof Bi_(2)Te_(3) decreased with decreasing temperature.When the temperature decreased from 180 K to 90 K,αdecreased from 124.6μV/K to 49.3μV/K,which is a quadratic function of temperature.