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Impedance spectroscopy models for the complete characterization of thermoelectric materials

Garcia Canadas, Jorge and Gao, Min 2014. Impedance spectroscopy models for the complete characterization of thermoelectric materials. Journal of Applied Physics 116 (17) , 174510. 10.1063/1.4901213

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Abstract

This paper analyses the use of impedance spectroscopy as a characterization tool applied to thermoelectric materials. The impedance function of the thermoelectric system under adiabatic conditions and Peltier mode operation is calculated by solving the heat equation in the frequency domain. The analysis, focused on the complex plane, provides the required equivalent circuit elements to interpret the impedance measurements. Using this approach, all the relevant thermoelectric parameters and thermal properties can be potentially extracted at a given temperature from the impedance spectra, i.e., the Seebeck coefficient, electrical resistivity, thermal conductivity, figure of merit (zT), specific heat, and thermal diffusivity. This can be done without the need of measuring temperature differences. To validate the models described, impedance measurements have been carried out in single thermoelectric elements and modules, showing an excellent agreement with the theory. The simple nature of the measurements in conjunction with the advantage of obtaining all the important thermoelectric parameters opens up the possibility of establishing impedance spectroscopy as a very useful characterization method for the thermoelectric field.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: Q Science > QC Physics
T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Additional Information: Publisher PDF uploaded in accordance with policy at http://www.sherpa.ac.uk/romeo/issn/0021-8979/ [accessed 19/11/14]
Publisher: American Institute of Physics
ISSN: 0021-8979
Funders: European Comission
Date of First Compliant Deposit: 30 March 2016
Date of Acceptance: 26 October 2014
Last Modified: 21 Feb 2019 15:16
URI: https://orca.cardiff.ac.uk/id/eprint/67427

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