Influence of Thomson effect on the resultant local Seebeck coefficient in thermoelectric composite materials |
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Authors: | Osamu Yamashita Hirotaka Odahara Takahiro Ochi and Kouji Satou |
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Institution: | (1) Materials Science, Co., Ltd., 5-5-44, Minamikasugaoka, Ibaraki, Osaka 567-0046, Japan;(2) Advanced Materials, Co., Ltd., 4-6-10, kizuri, Higashiosaka, Osaka 577-0827, Japan;(3) Faculty of Engineering, Ehime University, Bunkyocho, Matsuyama 790-8577, Japan |
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Abstract: | The resultant local Seebeck coefficient α
R (=α
S−α
T) at the interface of a thermoelement has not yet been measured, although it is an important factor governing the thermoelectric
efficiency, where α
S is the local Seebeck coefficient and α
T is the one caused by the Thomson effect. It is shown in this paper that α
S, α
T, and α
R of the p- and n-type Cu/Bi–Te/Cu composites are obtained analytically and experimentally on the assumption that the local temperature of
the composite on which the temperature difference ΔT is imposed varies linearly with changes in position along the composite. They were indeed estimated as a function of position
from the local experimental data of R,ΔI,ΔT, and V generated by applying an additional current of ±I to the composite, where R is the electrical resistance and ΔI is a current generated by the composite. As a result, it was found that the absolute values of α
S at the hot interface of the p- and n-type composites are approximately 1.5 and 1.4 times higher than their lowest values in the middle region of the composite,
respectively, while those of α
T are less than 8% of α
S all over the composite and are so small that the relation α
R≈α
S can be held. We thus succeeded in measuring α
R at the interfaces of the composite. |
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Keywords: | PACS" target="_blank">PACS 72 15 Jf 72 20 Pa 72 80 Tm |
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