Experimental conditions required for accurate measurements of electrical resistivity, thermal conductivity, and dimensionless figure of merit (ZT) using Harman and impedance spectroscopy methods
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Experimental conditions required for accurate measurements of electrical resistivity, thermal conductivity, and dimensionless figure of merit (ZT) using Harman and impedance spectroscopy methodsData de publicació
2019-01-11Editor
AIP PublishingCita bibliogràfica
BELTRÁN-PITARCH, Braulio, et al. Experimental conditions required for accurate measurements of electrical resistivity, thermal conductivity, and dimensionless figure of merit (ZT) using Harman and impedance spectroscopy methods. Journal of Applied Physics, 2019, 125.2: 025111.Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
https://aip.scitation.org/doi/full/10.1063/1.5077071Versió
info:eu-repo/semantics/publishedVersionParaules clau / Matèries
Resum
The Harman method is used extensively for the characterization of the dimensionless figure of merit ZT of thermoelectric (TE) materials and devices. However, its accuracy has often been questioned, since in many cases ... [+]
The Harman method is used extensively for the characterization of the dimensionless figure of merit ZT of thermoelectric (TE) materials and devices. However, its accuracy has often been questioned, since in many cases there are relatively high errors associated with the method. The impedance spectroscopy technique, which has recently been shown as a suitable tool to also characterize TE materials and devices, has some similarities with the Harman method and can also directly provide ZT. In order to obtain reliable measurements in both methods, there are some common critical points that must be taken into account, such as the requirement of fully adiabatic conditions and a negligible Joule effect. In this study, we have evaluated the effect of different experimental conditions in the accuracy of both methods using a sample with known TE properties. Our analysis has led to the identification of different sources of errors and other issues that have not been clearly identified to date that can lead to inaccurate results, namely, the need of a homogeneous Peltier effect at the junctions, problems arising from the use of Ag paint, and the selection of the right value for the current perturbation applied to the system. These problems and sources of errors need to be identified and carefully considered if accurate results are to be obtained. [-]
Proyecto de investigación
Spanish Agencia Estatal de Investigación, Ramón y Cajal program (No. RYC-2013-13970) ; Universitat JaumeI (Project No. UJI-A2016-08) ; K Engineering and Physical SciencesResearch Council (EP/K019767/1)Drets d'accés
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