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Improved Thermoelectric Properties in Melt-Spun SnTe
Dorra Ibrahim1, Viktoriia Ohorodniichuk1, Christophe Candolfi1
1Institut Jean Lamour, UMR 7198 CNRS-Université de Lorraine, 2 allée André Guinier-Campus ARTEM, BP 50840, 54011 Nancy Cedex, France.
Melt-spinning ultrafast-quenching enhances tin telluride (SnTe) thermoelectric performance by 40%. This technique optimizes microstructure and reduces hole concentration, boosting ZT values to 0.6 at 800 K.
Area of Science:
- Materials Science
- Solid State Physics
- Thermoelectrics
Background:
- Tin telluride (SnTe) exhibits high thermoelectric performance near 800 K when doped.
- Optimizing SnTe's thermoelectric properties is crucial for energy applications.
Purpose of the Study:
- To investigate the impact of melt-spinning ultrafast-quenching on polycrystalline SnTe's thermoelectric properties.
- To enhance the figure of merit (ZT) in SnTe through advanced synthesis techniques.
Main Methods:
- Melt-spinning ultrafast-quenching followed by spark plasma sintering.
- Comparative analysis with samples prepared by direct quenching and without quenching.
- Microstructural characterization and thermoelectric property measurements.
Main Results:
- Melt-spun SnTe samples exhibited a columnar microstructure, reducing lattice thermal conductivity below 700 K.
- A significant decrease in hole concentration was observed, likely due to Te loss during melt-spinning.
- Enhanced thermopower values above 500 K and a peak ZT of 0.6 at 800 K (40% increase) were achieved.
Conclusions:
- Melt-spinning is a novel and effective strategy for improving SnTe's thermoelectric properties.
- The technique offers a pathway to enhance ZT values in SnTe and potentially related compounds.
- Optimized microstructure and carrier concentration are key to improved thermoelectric performance.
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