Synthesis, Crystal Structure, and Transport Properties of the Hexagonal Mo<sub>9</sub> Cluster Compound Ag<sub>3</sub>RbMo<sub>9</sub>Se<sub>11</sub> - Archive ouverte HAL Access content directly
Journal Articles Inorganic Chemistry Year : 2017

Synthesis, Crystal Structure, and Transport Properties of the Hexagonal Mo9 Cluster Compound Ag3RbMo9Se11

Lionel Aranda
Anne Dauscher
Christophe Candolfi
Bertrand Lenoir

Abstract

Mo-based cluster compounds are promising candidates for thermoelectric applications at high temperatures due to their very low lattice thermal conductivity values. Here, we report on a detailed investigation of the crystal structure and transport properties measured in a wide range of temperatures (2-800 K) of polycrystalline Ag3RbMo9Se11. Single-crystal X-ray diffraction shows that this compound crystallizes in the hexagonal space group P63/m. The crystal structure is formed by stacked Mo9Se11 units leaving channels that are randomly filled by Rb+ cations, while Ag+ cations are located between the Mo9Se11 units. The high disorder in the unit cell induced by these atoms and their large anisotropic thermal displacement parameters are two key characteristics that lead to very low lattice thermal conductivity as low as 0.6 W m-1 K-1 at 800 K. The combination of semiconducting-like electrical properties and low ability to transport heat leads to a maximum dimensionless thermoelectric figure of merit ZT of 0.4 at 800 K.
Fichier principal
Vignette du fichier
Gougeon_manuscript.pdf (1.38 Mo) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-01579654 , version 1 (17-02-2023)

Identifiers

Cite

Patrick Gougeon, Philippe Gall, Odile Merdrignac-Conanec, Lionel Aranda, Anne Dauscher, et al.. Synthesis, Crystal Structure, and Transport Properties of the Hexagonal Mo9 Cluster Compound Ag3RbMo9Se11. Inorganic Chemistry, 2017, 56 (16), pp.9684-9692. ⟨10.1021/acs.inorgchem.7b01200⟩. ⟨hal-01579654⟩
209 View
0 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More