Influence of Nanostructure and Grain Refinement on the Thermoelectric Properties of Extruded Bulk Bi₂Te₂.₇Se₀.₃ Materials
DOI:
https://doi.org/10.63527/1607-8829-2026-3-19-37Keywords:
thermoelectric cooling, thermoelement, solid solution, extrusion, mobility, electrical conductivityAbstract
The electrical and thermal properties of extruded bulk nanostructured Bi₂Te₂.₇Se₀.₃ samples were investigated in the temperature range of ~77÷300 K and in magnetic fields up to 1.0 T. The results showed that at low temperatures the transport properties are mainly governed by charge carrier scattering at structural defects and grain boundaries. These imperfections act as effective scattering centers, reducing carrier mobility and electrical conductivity. As the grain size increases, the density of grain boundaries and the concentration of defects within the grains decrease, indicating an improvement in the material's microstructure. In addition, the concentration of ionized defects is reduced, which weakens impurity scattering and enhances charge carrier mobility.
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