This report describes thermoelectric properties up to 500 K for polycrystalline selenospinel Cu 6Fe 4Sn 12Se 32 samples. Thermal conductivity shows a low value of 1 W/Km because of their structural complexity such as Fe/Sn site disorder. Electrical resistivity ρ varies as exp(T 0/T 1/4) and thermopower S varies as T 1/2 at low temperatures, which indicates that Mott variable-range hopping is the dominant conduction mechanism. However, at high temperatures (above 350 K), ρ and S decrease simultaneously. The temperature dependences are attributed to the thermal excitation of electrons. The possible band structure for Cu 6Fe 4Sn 12Se 32 is examined to clarify the behavior of ρ and S.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering
- Materials Chemistry