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Issue 6, 2013
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Phase separation as a key to a thermoelectric high efficiency

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Abstract

This work elucidates the possible reasons for the outstanding, but never reproduced thermoelectric properties of the doped Ti0.5Zr0.25Hf0.25NiSn Heusler compounds. The structural investigations done via synchrotron X-ray diffraction measurements and scanning electron microscope measurements, which clearly show that the microstructure consists of three temperature stable C1b phases with possible semi-coherent interfaces, are presented. The exceptional thermoelectric properties are due to this intrinsic phase separation. It is possible to reproduce the high Figure of Merit values with ZT = 1.2 at 830 K. Furthermore, the influence of doping different elements on the Sn position in this Heusler material system is investigated.

Graphical abstract: Phase separation as a key to a thermoelectric high efficiency

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Publication details

The article was received on 06 Nov 2012, accepted on 05 Dec 2012 and first published on 05 Dec 2012


Article type: Paper
DOI: 10.1039/C2CP43946H
Phys. Chem. Chem. Phys., 2013,15, 1868-1872

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    Phase separation as a key to a thermoelectric high efficiency

    M. Schwall and B. Balke, Phys. Chem. Chem. Phys., 2013, 15, 1868
    DOI: 10.1039/C2CP43946H

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