Investigation into the extremely low thermal conductivity in Ba heavily doped BiCuSeO

Feng, Dan1,2; Zheng, Fengshan1,3; Wu, Di1; Wu, Minghui1; Li, Wei1; Huang, Li1; Zhao, Li-Dong4; He, Jiaqing1

2016-09

10.1016/j.nanoen.2016.07.003

Nano Energy   影响因子和分区

2211-2855

2211-3282

Heavily doped Bi0.875Ba0.125CuSeO alloys were found to exhibit the highest ever ZT value in oxygenous thermoelectric systems, attributed to the extremely low thermal conductivity. In this report, we investigated the microstructural reason of the thermal conductivity in Ba- heavily doped BiCuSeO through scanning transmission electron microscopy (STEM). We found a large amount of nano-scale BaSeO3 precipitates dispersed widely in BiCuSeO matrix grains; besides, for the first time, we provide visual evidence of Ba substituting Bi atoms in Bi-O layers. Combined with DFT calculations, we conclude that intrinsic lattice vibration anharmonicity, together with Ba-Bi alloying and excess BaSeO3 precipitation, is responsible for the observed low lattice thermal conductivity in experiments. (C) 2016 Elsevier Ltd. All rights reserved.

Thermoelectrics Spherical aberration-corrected transmission electron microscopy Lattice thermal conductivity Oxychalcogenide

SCI ; EI

英语

第一 ; 通讯

NSFC[11504160] ; NSFC[51571007]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied

WOS:000384910500020

ELSEVIER SCIENCE BV

20164102879343

Aberrations ; Barium ; Barium alloys ; High resolution transmission electron microscopy ; Lattice vibrations ; Nanotechnology ; Scanning electron microscopy ; Thermal conductivity of solids ; Transmission electron microscopy

Alkaline Earth Metals:549.2 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Thermodynamics:641.1 ; Optical Devices and Systems:741.3 ; Nanotechnology:761 ; Crystal Lattice:933.1.1

Web of Science

1.South Univ Sci & Technol China, Dept Phys, Shenzhen Key Lab Thermoelect Mat, Shenzhen 518055, Peoples R China
2.Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China
3.Forschungszentrum Julich, Ernst Ruska Ctr Microscopy & Spect Electrons ER C, D-52425 Julich, Germany
4.Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China

Feng, Dan,Zheng, Fengshan,Wu, Di,et al. Investigation into the extremely low thermal conductivity in Ba heavily doped BiCuSeO[J]. Nano Energy,2016,27:167-174.

Feng, Dan.,Zheng, Fengshan.,Wu, Di.,Wu, Minghui.,Li, Wei.,...&He, Jiaqing.(2016).Investigation into the extremely low thermal conductivity in Ba heavily doped BiCuSeO.Nano Energy,27,167-174.

Feng, Dan,et al."Investigation into the extremely low thermal conductivity in Ba heavily doped BiCuSeO".Nano Energy 27(2016):167-174.