### 抜粋

The Seebeck coefficient is the most widely measured property specific to thermoelectric materials. The absolute Seebeck coefficient S determined from the Thomson effect is highly sensitive to systematic errors incurred in the determination of the material thermal conductivity and geometry and heat loss from the sample to surroundings caused by temperature differences. Here, we report a technique for the precision measurement of S based on the Thomson effect using an ac-dc technique. This technique utilizes accurate equivalent-amplitude ac and dc currents, which can eliminate the need for acquiring accurate thermal conductivity and geometry values. These parameters can be replaced by the precisely and readily measurable parameters of electrical resistance and temperature changes caused by the Joule effect. The correction term of the heat loss owing to heat transfer via the thermocouple vanishes upon calculating the ratio of the measured temperature changes for both ac and dc excitations. We obtain an S value of -4.8 μV/K ± 0.2 μV/K at a temperature of 300 K for platinum, which is most widely used as a reference, with an expanded relative uncertainty of 4% (2σ). The obtained S value of Pt is closely consistent with that obtained from the conventional method using the Thomson effect within the uncertainty, and importantly, the measurement uncertainty improves to an acceptable level, which is four times more precise.

元の言語 | 英語 |
---|---|

記事番号 | 065312 |

ジャーナル | AIP Advances |

巻 | 9 |

発行部数 | 6 |

DOI | |

出版物ステータス | 出版済み - 6 1 2019 |

### All Science Journal Classification (ASJC) codes

- Physics and Astronomy(all)

## フィンガープリント Precise measurement of absolute Seebeck coefficient from Thomson effect using ac-dc technique' の研究トピックを掘り下げます。これらはともに一意のフィンガープリントを構成します。

## これを引用

*AIP Advances*,

*9*(6), [065312]. https://doi.org/10.1063/1.5095485