Simple, reversible gradient Seebeck coefficient measurement system for 300-600 K with COMSOL simulations

Area of Science:

• Materials Science
• Condensed Matter Physics
• Thermodynamics

Background:

• Accurate Seebeck coefficient measurement is vital for thermoelectric material characterization.
• Existing measurement systems can be complex and challenging to implement.
• A simpler, more accessible system is needed for broader research applications.

Purpose of the Study:

• To report a simple, cost-effective system for Seebeck coefficient measurement.
• To enable accurate characterization of thermoelectric samples within a specific temperature range.
• To overcome limitations of existing complex instrumental designs.

Main Methods:

• A novel system design utilizing separately controlled brass block heaters sandwiching the sample.
• Application of a reversible temperature gradient in quasi-static direct current mode.
• Utilizing silver caps for minimal thermal resistance and stable temperature contact.

Main Results:

• The system successfully measures the Seebeck coefficient in the temperature range of 300-600 K.
• Experimental results and COMSOL simulations confirm stable temperature and insignificant thermal resistance.
• Achieved variance up to ±2% and accuracy up to 8% at high temperatures through calibration.

Conclusions:

• The developed system offers a simplified approach to Seebeck coefficient measurement.
• Its design ensures minimal thermal and electrical contact resistance for reliable data.
• This system is suitable for characterizing thermoelectric materials, particularly near room temperature.