[Cs_(14)Cl][Tm_(71)Se_(110)]:An unusual salt-inclusion chalcogenide containing different valent Tm centers and ultralow thermal conductivity  

作　　者：Hong Chen Mao-Yin Ran Long-Hua Li Xin-Tao Wu Hua Lin 

机构地区：[1]State Key Laboratory of Structural Chemistry,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou,350002,China [2]Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China,Fuzhou,350002,China [3]University of Chinese Academy of Sciences,Beijing,100049,China [4]School of Chemistry and Chemical Engineering,Jiangsu University,Zhenjiang,212013,China

出　　处：《Chinese Journal of Structural Chemistry》2024年第10期42-48,共7页结构化学(英文)

基　　金：supported by the National Natural Science Foundation of China(22005304 and 22175175);Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China(2021ZR118);the Natural Science Foundation of Fujian Province(2022L3092 and 2023H0041).

摘　　要：As an emerging class of inorganic hybrid materials,salt-inclusion chalcogenides(SICs)have garnered significant attention in the past decade owing to their distinct host-guest structural characteristics and outstanding perfor-mance in the field of optoelectronics.In this study,a novel quaternary SIC[Cs_(14)Cl][Tm_(71)Se_(110)]has been discovered using an appropriate flux method.The structure comprises two distinct parts within the lattice:the host[Tm_(71)Se_(110)]^(13-)framework and the guest[Cs_(14)Cl]^(13+)polycation.Notably,this structure reveals the presence of mixed-valent Tm^(2+)/Tm^(3+)and different types of closed cavities for the first time.Additionally,thermal transport performance testing shows that it has ultralow thermal conductivity,ranging from 0.29 to 0.24 W/m·K within the temperature range of 323-673 K,which is one of the lowest reported values among polycrystalline chalcogenides.This research not only advances the coordination chemistry of rare-earth-based compounds but also reaffirms that SIC semiconductors are promising systems for achieving ultralow thermal conductivity.

关 键 词：Salt-inclusion chalcogenide Rare-earth element Mixed valence state Ultralow thermal conductivity Thermoelectric material 

分 类 号：TB3[一般工业技术—材料科学与工程]