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Multiband Transport in CoSb₃ Prepared by Rapid Solidification.

Matthias Ikeda¹, Petr Tomeš¹, Lukas Prochaska¹

¹Institute of Solid State Physics, TU Wien, Wiedner Hauptstr. 8-10, 1040 Vienna, Austria.

Zeitschrift Fur Anorganische Und Allgemeine Chemie

|March 1, 2016

Summary

Nano-grained cobalt antimony (CoSb₃) was synthesized to investigate nanostructure effects on thermoelectric properties. Cooling speed influenced microstructure and thermal conductivity, with bulk density being a key factor.

Keywords:

Melt‐spinning Multiband Skutterudite

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

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Area of Science:

Materials Science
Solid State Physics
Nanotechnology

Background:

Skutterudite thermoelectric properties, particularly phonon thermal conductivity, are sensitive to guest atom type and concentration.
Unfilled CoSb₃ serves as a model compound to isolate the effects of nanostructuring on thermoelectric performance.
Controlling microstructure is crucial for optimizing thermoelectric materials.

Purpose of the Study:

To investigate the impact of nanostructuring on the thermoelectric properties of CoSb₃.
To study the influence of cooling speed during preparation on the microstructure and thermal conductivity of melt-spun CoSb₃.
To analyze the effects of secondary phases (Sb and CoSb₂) on the electronic properties and overall thermoelectric performance.

Main Methods:

Melt-spinning and spark plasma sintering for nano-grained CoSb₃ preparation.
Flash and 3ω measurements to determine phonon thermal conductivity.
Multi-band Hall effect analysis to understand electronic properties and charge carrier behavior.

Main Results:

Melt-spun CoSb₃ microstructure was sensitive to cooling speed, unlike clathrates.
Phonon thermal conductivity correlated with grain size, but bulk density had a stronger impact.
Reduced bulk density did not increase electrical resistivity; secondary phases (Sb, CoSb₂) influenced charge carrier density and mobility.

Conclusions:

Nanostructuring and controlled porosity (bulk density) are effective strategies for tuning the thermoelectric properties of CoSb₃.
The presence of Sb and CoSb₂ phases offers potential for creating efficient thermoelectric composite materials by modifying electronic transport.
Optimizing cooling rates and managing secondary phases are key for developing advanced thermoelectric materials.