Instrument for simultaneous measurement of Seebeck coefficient and thermal conductivity in the temperature range 300-800 K with python interfacing

Abstract

Fabrication and characterization of instrument for high-temperature simultaneous measurement of Seebeck coefficient (S) and thermal conductivity ($\kappa$) has been carried out with python automation. The steady-state based Fourier's law of thermal conduction is employed for $\kappa$ measurement. The parallel thermal conductance technique is implemented for heat loss measurement. Introducing the thin heater and insulating heater base minimize the heat loss and make the way easier to arrive at high temperature. Measurement of S is carried out using differential method. Same thermocouples are used to measure temperature as well as voltage for S measurement. Care of temperature dependent S of thermocouple has also been taken. Simple design, small size, lightweightmake this instrument more robust. All the components for making sample holder are easily available in the market and can be replaced as per the user demand. This instrument can measure samples with various dimensions and shapes in the temperature range 300 $-$ 800 K. The instrument is validated using different class of samples, such as nickel, gadolinium, Fe${}_2$VAl and LaCoO${}_3$. Wide range of S from $\sim$ $-$20 to $\sim$600 $\mu$V/K and $\kappa$ from $\sim$1.1 to $\sim$23.5 W/m-K are studied. The measured values of S and k are in good agreement with the reported data.

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