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Improved Thomson Coefficient Measurements Using an AC Method

Published online by Cambridge University Press:  19 May 2014

Yasutaka Amagai ,
Atsushi Yamamoto ,
Megumi Akoshima  and
Hiroyuki Fujiki
Yasutaka Amagai
Affiliation:
National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan
Atsushi Yamamoto
Affiliation:
Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
Megumi Akoshima
Affiliation:
National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan
Hiroyuki Fujiki
Affiliation:
National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan
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Abstract

We present an improved AC (Alternating Current) method for the determination of the Thomson coefficient, which can be used for obtaining the absolute Seebeck coefficient. While previous work has focused on DC (Direct Current) methods, we analyze the influence of an AC current in order to derive the Thomson coefficient of a thin wire from measurable quantities. Our expression requires five parameters including AC current, resistance, temperature gradient, and the temperature changes due to the Thomson and Joule effects. Thus, a prior determination of thermal conductivity and sample geometry is not required, unlike DC methods. In order to validate our analysis, the Thomson coefficient of a thin Pt wire has been measured at several frequencies. The results agree with those obtained from a conventional DC method.

Keywords

thermoelectricthermoelectricitythermal conductivity
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1642: Symposium BB – Thermoelectric Materials—From Basic Science to Applications , 2014 , mrsf13-1642-bb08-24
Copyright
Copyright © Materials Research Society 2014 

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References

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