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A rapid method to extract Seebeck coefficient under a large temperature difference.

Qing Zhu1, Hee Seok Kim2, Zhifeng Ren1

  • 1Department of Physics and The Texas Center for Superconductivity, University of Houston, Houston, Texas 77204, USA.

The Review of Scientific Instruments
|October 2, 2017
PubMed
Summary
This summary is machine-generated.

A new quasi-steady state method accurately measures the Seebeck coefficient in thermoelectric materials under large temperature gradients. This faster, precise technique works during both heating and cooling cycles.

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Area of Science:

  • Materials Science
  • Solid State Physics

Background:

  • The Seebeck coefficient is crucial for thermoelectric material performance.
  • Real-world applications often involve significant temperature differences, posing measurement challenges.

Purpose of the Study:

  • To develop and validate a quasi-steady state method for accurate Seebeck coefficient measurement under large temperature gradients.
  • To offer a less time-consuming and highly accurate alternative to existing methods.

Main Methods:

  • Implementation of a quasi-steady state measurement technique.
  • Testing on a Zintl material (Mg3.15Nb0.05Sb1.5Bi0.49Te0.01) from room temperature to 573 K.
  • Comparison with a commercialized Seebeck coefficient measurement device (ZEM-3).

Main Results:

  • The proposed method provides accurate Seebeck coefficient measurements under substantial temperature gradients.
  • Measurements were successfully performed during both heating and cooling phases.
  • Results showed a ±5% difference compared to the ZEM-3 device.

Conclusions:

  • The quasi-steady state method is a viable and accurate approach for Seebeck coefficient determination in thermoelectric materials.
  • This method offers advantages in speed and accuracy, especially under challenging temperature conditions.
  • The study validates the method using a specific Zintl compound.