Thermoelectric Properties of Highly Deformed and Subsequently Annealed p-Type (Bi0.25Sb0.75)2Te3 Alloys
| Autor: | Dow Bin Hyun, Sung-Jin Jung, Seong Keun Kim, Seung Hyub Baek, Hyung Ho Park, Jin Sang Kim |
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| Rok vydání: | 2013 |
| Předmět: |
Quenching
Materials science Annealing (metallurgy) Metallurgy Recrystallization (metallurgy) Condensed Matter Physics Microstructure Electronic Optical and Magnetic Materials Electrical resistivity and conductivity Seebeck coefficient Thermoelectric effect Materials Chemistry Grain boundary Electrical and Electronic Engineering |
| Zdroj: | Journal of Electronic Materials. 43:1726-1732 |
| ISSN: | 1543-186X 0361-5235 |
| DOI: | 10.1007/s11664-013-2851-1 |
| Popis: | The effects of mechanical deformation and subsequent annealing on the thermoelectric properties and microstructure have been investigated for p-type (Bi0.25Sb0.75)2Te3 alloys prepared by melting followed by quenching. The mechanically deformed pellets were prepared by repetition of cold-pressing of quenched samples at room temperature. Cold-pressed pellets were then annealed at 300°C in vacuum, and the thermoelectric properties and microstructure were traced through the course of the heat treatment. For the heavily deformed samples, the Seebeck coefficient rapidly increased at the very early stage of annealing and did not change as the annealing time increased, due to recrystallization of a new δ-phase which equilibrated at the annealing temperature of 300°C (δ300-phase). At the initial stage of annealing (recovery stage), the electrical resistivity sharply increased, probably due to the interaction of antistructural defects with vacancies produced during the cold-pressing treatment. However, for the lightly deformed samples, recrystallization occurred only at some portion of the grain boundaries, and the newly generated δ300-phase slowly replaced the original, as-solidified δingot-phase. |
| Databáze: | OpenAIRE |
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