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Issue 3, 2017
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Structural and thermoelectric properties of n-type isocubanite CuFe2S3

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Abstract

An effective strategy to enhance thermoelectric performance consists of scattering phonons by point defects, such as the ones intrinsic to the n-type isocubanite CuFe2S3. In this structure, the TEM evidences a random distribution of vacancies, and copper and iron ions of the 4c and 4d sites naturally reduce the phonon lifetime. Furthermore, orthorhombic and cubic cubanite are usually found in their natural states intimately intergrown with other sulfides such as chalcopyrite (CuFeS2) and pyrrhotite (Fe7S8). We performed comprehensive studies of Rietveld analysis of X-ray diffraction, transmission electron microscopy, and thermoelectric transport measurements of the n-type isocubanite CuFe2S3, and we obtained a maximum ZT value of 0.14 at 700 K in this environmentally friendly compound. Our electronic structure calculations support the fact that chalcopyrite CuFeS2 is an antiferromagnetic insulator, together with a higher degree of covalency of sulfide compared to oxides. The weak temperature dependence of the resistivity points towards strong disorder in the 4c and 4d sites of the isocubanite.

Graphical abstract: Structural and thermoelectric properties of n-type isocubanite CuFe2S3

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Publication details

The article was received on 17 Nov 2016, accepted on 17 Dec 2016 and first published on 21 Dec 2016


Article type: Research Article
DOI: 10.1039/C6QI00510A
Citation: Inorg. Chem. Front., 2017,4, 424-432
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    Structural and thermoelectric properties of n-type isocubanite CuFe2S3

    T. Barbier, D. Berthebaud, R. Frésard, O. I. Lebedev, E. Guilmeau, V. Eyert and A. Maignan, Inorg. Chem. Front., 2017, 4, 424
    DOI: 10.1039/C6QI00510A

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