Issue 4, 2021

Ultralow thermal conductivity in the quaternary semiconducting chalcogenide Cs4[Ho26Cd7Se48] with an unprecedented closed cavity architecture

Abstract

Novel three-dimensional (3D) inorganic chalcogenide architectures have attracted much attention because of their rich structural assembly patterns and intriguing physical properties. Herein, four isostructural quaternary semiconducting chalcogenides, namely Cs4[RE26Cd7Se48] (RE = Ho, Er, Tm, and Lu), have been discovered and found to crystallize in a tetragonal system, space group I41/a (no. 88). Their structures feature 3D quasi-NaCl type architectures formed by edge-sharing and face-sharing of [RESe6] and [MSe6] (M = RE/Cd) octahedra, which are embedded with the unprecedented polyanionic [Cs2@Se18–Cd–Cs2@Se18] closed cavities. Significantly, the compound Cs4[Ho26Cd7Se48] exhibits ultralow thermal conductivity (0.38–0.29 W m−1 K−1) from 295 K to 675 K, which is one of the lowest values reported in crystalline chalcogenides. This result not only enriches the coordination chemistry of host–guest systems, but also suggests a new thought for the design of novel inorganic chalcogenides with intrinsic low thermal conductivities.

Graphical abstract: Ultralow thermal conductivity in the quaternary semiconducting chalcogenide Cs4[Ho26Cd7Se48] with an unprecedented closed cavity architecture

Supplementary files

Article information

Article type
Research Article
Submitted
15 Okt 2020
Accepted
28 Nov 2020
First published
08 Des 2020

Inorg. Chem. Front., 2021,8, 1049-1055

Ultralow thermal conductivity in the quaternary semiconducting chalcogenide Cs4[Ho26Cd7Se48] with an unprecedented closed cavity architecture

H. Chen, P. Liu, H. Lin and X. Wu, Inorg. Chem. Front., 2021, 8, 1049 DOI: 10.1039/D0QI01240H

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