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Ternary MIn2S4 (M = Mn, Fe, Co, Ni) Thiospinels - Crystal Structure and Thermoelectric Properties

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Wyżga,  Paweł
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Veremchuk,  Igor
Igor Veremchuk, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Bobnar,  Matej
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Leithe-Jasper,  Andreas
Andreas Leithe-Jasper, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Wyżga, P., Veremchuk, I., Bobnar, M., Hennig, C., Leithe-Jasper, A., & Gumeniuk, R. (2020). Ternary MIn2S4 (M = Mn, Fe, Co, Ni) Thiospinels - Crystal Structure and Thermoelectric Properties. Zeitschrift für anorganische und allgemeine Chemie, 646(14), 1091-1098. doi:10.1002/zaac.202000014.


Cite as: http://hdl.handle.net/21.11116/0000-0006-404A-F
Abstract
A combined structural, magnetic and thermoelectric study of polycrystalline ternary MIn2S4 (M = Mn, Fe, Co, Ni) thiospinels is presented. All compounds crystallize with MgAl2O4-type structure. Rietveld refinement analysis confirmed that the preferred crystallographic position of transition metal element changes from mainly tetrahedral 8a for Mn to exclusively octahedral 16d for Ni (i.e. increase of the inversion parameter). Magnetic susceptibility measurements revealed M-elements to possess 2+ oxidation state in MIn2S4. All these compounds order antiferromagnetically with Neel temperatures T-N ranging from 5-13 K. The studied thiospinels are n-type semiconductors with large values of electrical resistivity rho > 0.6 omega center dot m at room temperature. An increase of the inversion parameter leads to a reduction of the determined activation energies, as well as to a more disorder-like behavior of thermal conductivity. The highest thermoelectric Figure of merit ZT was observed for MIn2S4 with M = Fe, Ni, which adopt inverse spinel structure.