Publication date: 10th April 2024
Pyrochlore oxides are widely known for their dielectric properties due to its large band gap. In the thermoelectric aspect they show a low thermal and electrical conductivity and high Seebeck coefficient of mV/K order [1]. However, figure of merit ZT for standalone pyrochlore oxides is low and not suited for thermoelectric applications.
In recent years, high configurational entropy phenomenon was under intense investigations in a wide range of materials due to massive changes of properties in some cases. One of the important changes is reduction of lattice thermal conductivity in materials mostly thanks to increase of photon scattering [2]. Additionally, high entropy can sometimes stabilize forms of crystalline matter and incorporate additional cations into lattices, further enhancing properties of material.
Metal based alloys are one of the best and common materials used in the world in many applications. They excel as construction materials, electrical and thermal conductors and many more adoptions because of the variety of their properties. In the field of thermoelectric properties, metal alloys are currently under heavy investigation as a result of high performance of Bi2Te3 and SnSe [3]. Metal alloys show high thermal and electrical conductivity and moderate Seebeck coefficient.
This study explores thermoelectrics properties of new composite materials based on high-entropy pyrochlore (HEP) oxides (Zr0.2Sn0.2Ti0.2Hf0.2Fe0.2)2(Sr1-x Lax)2O7 and metal alloy (Fe1-yCuy) with different weight ratios, in order to optimize properties of main formula (HEP1-z/metalz). The X-ray Diffractometry (XRD) and Scanning Electron Microscopy (SEM) will be used to study the structure and microstructure of materials and composites. The temperature dependence of the total Seebeck coefficient will be measured and analyzed. For electrical conductivity measurements, dependent on temperature, a DC four-wire technique will be used. All experiments will be held in two different atmospheric conditions, with high and low concentration of water vapour during measurement.
Financial support of these studies from Gdańsk University of Technology by the DEC-2/1/2023/IDUB/III.1a/Ra grant under the RADIUM - ‘Excellence Initiative - Research University’ program is gratefully acknowledged.
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