Development of high temperature simultaneous measurement method for three thermoelectric properties with thermocouple probes

Abstract

Simultaneous measurement method for electrical resistivity, Seebeck coefficient, and thermal diffusivity is proposed, which can achieve a measurement over a wide temperature range above room temperature. Thermocouple probes and sample stage for high temperature were developed, and combined with a measurement system which enable us to measure three thermoelectric properties in a single setup. The validity of developed measurement system was evaluated at room temperature using constantan slab as a reference material. In addition, measurements of temperature dependence of three thermoelectric properties were performed in the temperature range of room temperature to high temperatures of 820 K to 1173 K using four different materials: Ni, zirconia, SRM 3452 (B-doped Si₈₀Ge₂₀) of standard material for the Seebeck coefficient, and Li-doped NiO. The results showed high repeatability and good agreement with reference values.