Long-term stability of phase-separated half-Heusler compounds

Krez J, Balke B, Ouardi S, Selle S, Hoeche T, Felser C, Hermes W, Schwind M (2015)

Publication Type: Journal article

Publication year: 2015

Journal

Physical Chemistry Chemical Physics Royal Society of Chemistry

Book Volume: 17

Pages Range: 29854-29858

Journal Issue: 44

DOI: 10.1039/c4cp04875j

Abstract

Half-Heusler (HH) compounds have shown high figure of merit up to 1.5. Here, we address the long-term stability of n- and p-type HH materials. For this purpose, we investigated HH materials based on the Ti0.3Zr0.35Hf0.35NiSn-system after 500 cycles (1700 h) from 373 to 873 K. Both compounds exhibit a maximum Seebeck coefficient of α ≈ 210 μV K-1 and a phase separation into two HH phases. The dendritic microstructure is temperature resistant and upon cycling the changes in the microstructure are so marginal that the low thermal conductivity values (κ < 4 W m-1 K-1) could be maintained. Our results emphasize that phase-separated HH compounds are suitable low cost materials and can lead to enhanced thermoelectric efficiencies beyond the set benchmark for industrial applications.

Involved external institutions

Johannes Gutenberg-Universität Mainz (JGU) DE Germany (DE) Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids DE Germany (DE) Fraunhofer-Institut für Werkstoffmechanik (IWM) / Fraunhofer Institute for Mechanics of Materials DE Germany (DE) BASF SE DE Germany (DE)

How to cite

APA:

Krez, J., Balke, B., Ouardi, S., Selle, S., Hoeche, T., Felser, C.,... Schwind, M. (2015). Long-term stability of phase-separated half-Heusler compounds. Physical Chemistry Chemical Physics, 17(44), 29854-29858. https://doi.org/10.1039/c4cp04875j

MLA:

Krez, J., et al. "Long-term stability of phase-separated half-Heusler compounds." Physical Chemistry Chemical Physics 17.44 (2015): 29854-29858.

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