The electrical and thermal transmission characteristics of Bi0.5Sb1.5Te3 thermoelectric alloy were simultaneously optimized by double-boundary engineering


There is a strong interdependence between the Seebeck coefficient, conductivity, and thermal conductivity, so obtaining a high thermoelectric merit value ZT isn't easy. Designing a new structure to decouple these parameters is crucial. Here, we combine the liquid manipulation method of solidified Bi 0.5Sb 1.5Te three alloys with subsequent melt spinning, ball milling, and spark plasma sintering processes to construct specialized microstructures containing many 60° twin boundaries. These twin boundaries disperse low energy carriers, increasing Seebeck's coefficient. Secondly, they provide relatively high carrier mobility, compensating for the negative effect of reduced hole concentration on conductivity. Thirdly, experimental and computational results show that the twin boundary scattering is responsible for the apparent decrease of lattice thermal conductivity. Thus, the highest ZT value reached 1.42 at 348K, 27% higher than the sample with a few twin boundaries without liquid treatment. The average ZT value from 300K to 400K reached 1.34. Our unique sample treatment method makes Gemini-dominated microstructure an effective way to optimize thermoelectric parameters simultaneously. If you are looking for high quality, high purity and cost-effective bismuth telluride, or if you require the latest price of bismuth telluride, please feel free to email contact mis-asia.

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