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• W3030575087 endingPage "155804" @default.
• W3030575087 startingPage "155804" @default.
• W3030575087 abstract "Decoupling the Seebeck coefficient, electrical and thermal conductivity has been a great challenge in efforts to obtain thermoelectric materials with a high figure of merit (ZT) for power generation and cooling applications. In this work, p-type Bi0.5Sb1.5Te3 samples were fabricated by combining gas atomization and spark plasma sintering. Heat-treatment and subsequent consolidation during SPS stimulated the recrystallization of grains and reduced texture, contributing to reduced carrier scattering. This enhanced carrier mobility by 29%. The recrystallization also induces a hierarchy of fine and coarse crystal grains with random orientations. This mixed microstructure contributed to the simultaneous enhancement of the Seebeck coefficient and electrical conductivity, while reducing lattice thermal conductivity, due to effective phonon scattering by the fine grains and Sb2O3 nanoparticles. The significant improvement in power factor and relatively low κL resulted in a peak ZT of 1.1 at 350 K for the 470 °C treated sample. This was about 47% higher than the initial sample (ZT = 0.75 at 350 K). The average ZT for all the heat treated samples reached over unity in the range of 300–500 K. This work suggests that the spark plasma heat treatment and consolidation processes enable the recrystallization, allowing the thermoelectric properties to be decoupled, enhancing ZT." @default.
• W3030575087 created "2020-06-05" @default.
• W3030575087 creator A5008474683 @default.
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• W3030575087 date "2020-11-01" @default.
• W3030575087 modified "2023-10-17" @default.
• W3030575087 title "Recrystallization stimulated hierarchical structures for the simultaneous enhancement of Seebeck coefficient and electrical conductivity in Bi-Sb-Te alloys" @default.
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• W3030575087 doi "https://doi.org/10.1016/j.jallcom.2020.155804" @default.
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