English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Fine tuning of thermoelectric performance in phase-separated half-Heusler compounds

MPS-Authors
/persons/resource/persons134308

Rausch,  Elisabeth
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126789

Ouardi,  Siham
Siham Ouardi, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126556

Burkhardt,  Ulrich
Ulrich Burkhardt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126601

Felser,  Claudia
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

External Ressource
No external resources are shared
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

Rausch, E., Balke, B., Stahlhofen, J. M., Ouardi, S., Burkhardt, U., & Felser, C. (2015). Fine tuning of thermoelectric performance in phase-separated half-Heusler compounds. Journal of Materials Chemistry C: Materials for Optical and Electronic Devices, 3(40), 10409-10414. doi:10.1039/C5TC01196E.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0027-C19D-B
Abstract
Two successful recipes to enhance the thermoelectric performance,} namely carrier concentration optimization and reduction of thermal conductivity{,} have been combined and applied to the p-type (Ti/Zr/Hf)CoSb1-xSnx system. An intrinsic micrometer-scale phase separation increases the phonon scattering and reduces the lattice thermal conductivity. A substitution of 15 Sb by Sn optimizes the electronic properties. Starting from this{,} further improvement of the thermoelectric properties has been achieved by a fine tuning of the Ti to Hf ratio. The microstructuring of the samples was studied in detail with high-resolution synchrotron powder X-ray diffraction and element mapping electron microscopy. Linking the structural with the thermoelectric properties{,} a record thermoelectric figure of merit for p-type half-Heusler compounds of ZT [approximate] 1.2 at 710 [degree]C in Ti0.25Hf0.75CoSb0.85Sn0.15 was achieved. The phase separation approach can form a significant alternative to nanostructuring processing{,} saving time{, energy consumption and increasing the thermoelectric efficiency.