Issue 44, 2015

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

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.

Graphical abstract: Long-term stability of phase-separated half-Heusler compounds

Article information

Article type
Paper
Submitted
24 Oct 2014
Accepted
15 Oct 2015
First published
15 Oct 2015

Phys. Chem. Chem. Phys., 2015,17, 29854-29858

Author version available

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

J. Krez, B. Balke, S. Ouardi, S. Selle, T. Höche, C. Felser, W. Hermes and M. Schwind, Phys. Chem. Chem. Phys., 2015, 17, 29854 DOI: 10.1039/C4CP04875J

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