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.

Authors with CRIS profile

Claudia Felser

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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