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Ternary M In 2 S 4 ( M = Mn, Fe, Co, Ni) Thiospinels – Crystal Structure and Thermoelectric Properties
Author(s) -
Wyżga Paweł,
Veremchuk Igor,
Bobnar Matej,
Hennig Christoph,
LeitheJasper Andreas,
Gumeniuk Roman
Publication year - 2020
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.202000014
Subject(s) - ternary operation , materials science , thermoelectric effect , spinel , electrical resistivity and conductivity , crystallography , crystal structure , seebeck coefficient , rietveld refinement , analytical chemistry (journal) , thermal conductivity , chemistry , metallurgy , thermodynamics , physics , quantum mechanics , computer science , composite material , programming language , chromatography
A combined structural, magnetic and thermoelectric study of polycrystalline ternary M In 2 S 4 ( M = Mn, Fe, Co, Ni) thiospinels is presented. All compounds crystallize with MgAl 2 O 4 ‐type structure. Rietveld refinement analysis confirmed that the preferred crystallographic position of transition metal element changes from mainly tetrahedral 8 a for Mn to exclusively octahedral 16 d for Ni (i.e. increase of the inversion parameter). Magnetic susceptibility measurements revealed M ‐elements to possess 2+ oxidation state in M In 2 S 4 . All these compounds order antiferromagnetically with Néel temperatures T N ranging from 5–13 K. The studied thiospinels are n ‐type semiconductors with large values of electrical resistivity ρ > 0.6 Ω · 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 M In 2 S 4 with M = Fe, Ni, which adopt inverse spinel structure.