Synthesis, crystal structure and transport properties of the cluster compounds Tl<sub>2</sub>Mo<sub>15</sub>S<sub>19</sub> and Ag<sub>3</sub>Tl<sub>2</sub>Mo<sub>15</sub>S<sub>19</sub> - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Materials Research Bulletin Année : 2021

Synthesis, crystal structure and transport properties of the cluster compounds Tl2Mo15S19 and Ag3Tl2Mo15S19

Shantanu Misra
Anne Dauscher
Christophe Candolfi
Bertrand Lenoir

Résumé

We report the syntheses and crystal structures of the cluster compounds Tl2Mo15S19 and Ag3Tl2Mo15S19, two novel members of the series M2Mo15X19 (M = In, Tl, K, Rb, Cs, Ba; X = S, Se). While only single crystals of Tl2Mo15S19 were obtained, Ag3Tl2Mo15S19 powders were synthesized, allowing for a study of its thermoelectric properties. Their structures contain Mo6S8iS6a and Mo9S11iS6a units separated by Tl+ cations. Silver insertion increases the electron transfer towards the Mo clusters leading to modifications of the Mo-Mo distances. Electrical resistivity measurements on Tl2Mo15S19 evidence its metallic character. Inserting Ag drives the transport properties towards a semiconducting state characterized by relatively low electrical resistivity and thermopower values. The large, complex unit cell of these compounds results in very low lattice thermal conductivity values below 1 Wm−1 K−1. Although the Ag insertion improves the thermoelectric performances, the ZT value remains moderate with a maximum value of 0.2 at 800 K.
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hal-03103506 , version 1 (18-02-2021)

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Patrick Gougeon, Philippe Gall, Shantanu Misra, Anne Dauscher, Christophe Candolfi, et al.. Synthesis, crystal structure and transport properties of the cluster compounds Tl2Mo15S19 and Ag3Tl2Mo15S19. Materials Research Bulletin, 2021, 136, pp.111152. ⟨10.1016/j.materresbull.2020.111152⟩. ⟨hal-03103506⟩
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