Synergistic effect of bonding heterogeneity and phonon localization in introducing excellent thermoelectric properties in layered heteroanionic NdZnSbO material  

作　　者：Da Wan Shuwei Tang Shulin Bai Xiaodong Li Peng Ai Wanrong Guo Tuo Zheng 

机构地区：[1]College of Materials Science and Engineering,Liaoning Technical University,Fuxin 123000,Liaoning,China [2]Faculty of Chemistry,Northeast Normal University,Changchun 130024,Jilin,China

出　　处：《Journal of Energy Chemistry》2025年第1期259-272,共14页能源化学(英文版)

基　　金：Financial supports from the National Natural Science Foundation of China(21503039);Department of Science and Technology of Liaoning Province(2019MS164);Department of Education of Liaoning Province(LJ2020JCL034);Discipline Innovation Team of Liaoning Technical University(LNTU20TD-16)are greatly acknowledged。

摘　　要：Layered rare-earth metal oxides,harnessing the dual properties of oxides and two-dimensional layered materials,exhibit remarkable thermal stability and quantum confinement effects.Therefore,this work adopts the first-principles calculation combined with the Boltzmann transport theory to predict the thermoelectric properties of NdZnSbO compound.The coexistence of weak interlayer van der Waals interactions,robust intralayer ionic bonding,and partial covalent bonding leads to remarkable bonding heterogeneity,which engenders pronounced phonon scattering and imposes constraints on thermal transport along the out-of-plane direction.The weakened chemical bonds induced by the antibonding states,together with the rattling-like behavior of the Zn atom,culminate in the profound anharmonicity in the layered NdZnSbO compound.The weakening bond and heavy element contribute to the softness of phonon modes,which significantly diminishes the phonon group velocity.The redistribution-dominated four-phonon scattering process spans a large optical gap,which effectively reduces the lattice thermal conductivity.The NdZnSbO compound exhibits direct semiconductor characteristic with a bandgap of 0.73 e V by adopting the Heyd-Scuseria-Ernzerhof(HSE06)functional in combination with spin–orbit coupling(SOC)effect.The multi-valley feature of NdZnSbO compound augur favorably for band degeneracy,thus amplifying the power factor.Consequently,an optimal figure-of-merit(ZT)of 3.40 at 900 K is achieved for the n-type NdZnSbO compound.The present study delves deeply insights into the origins for the low thermal conductivity of NdZnSbO compound and proposes an optimization scheme to enhance overall thermoelectric performance.

关 键 词：Heteroanionic materials Multi-valley characteristics Four-phonon scattering Bonding heterogeneity Rattling-like behavior 

分 类 号：TG1[金属学及工艺—金属学]