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

Dan Feng; Fengshan Zheng; Di Wu; Minghui Wu; Wei Li; Li Huang; Li Dong Zhao; Jiaqing He

doi:10.1016/j.nanoen.2016.07.003

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

Dan Feng
, Fengshan Zheng
, Di Wu
, Minghui Wu
, Wei Li
, Li Huang
, Li Dong Zhao
, Jiaqing He^*

^*Corresponding author for this work

School of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

52 Scopus citations

Abstract

Heavily doped Bi_0.875Ba_0.125CuSeO 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.

Original language	English
Pages (from-to)	167-174
Number of pages	8
Journal	Nano Energy
Volume	27
DOIs	https://doi.org/10.1016/j.nanoen.2016.07.003
State	Published - 1 Sep 2016

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Keywords

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

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10.1016/j.nanoen.2016.07.003

Cite this

@article{f4d801d74fc84009b2c2afa55b77e034,

title = "Investigation into the extremely low thermal conductivity in Ba heavily doped BiCuSeO",

abstract = "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.",

keywords = "Lattice thermal conductivity, Oxychalcogenide, Spherical aberration-corrected transmission electron microscopy, Thermoelectrics",

author = "Dan Feng and Fengshan Zheng and Di Wu and Minghui Wu and Wei Li and Li Huang and Zhao, \{Li Dong\} and Jiaqing He",

note = "Publisher Copyright: {\textcopyright} 2016 Elsevier Ltd",

year = "2016",

month = sep,

day = "1",

doi = "10.1016/j.nanoen.2016.07.003",

language = "英语",

volume = "27",

pages = "167--174",

journal = "Nano Energy",

issn = "2211-2855",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Investigation into the extremely low thermal conductivity in Ba heavily doped BiCuSeO

AU - Feng, Dan

AU - Zheng, Fengshan

AU - Wu, Di

AU - Wu, Minghui

AU - Li, Wei

AU - Huang, Li

AU - Zhao, Li Dong

AU - He, Jiaqing

PY - 2016/9/1

Y1 - 2016/9/1

N2 - 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.

AB - 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.

KW - Lattice thermal conductivity

KW - Oxychalcogenide

KW - Spherical aberration-corrected transmission electron microscopy

KW - Thermoelectrics

UR - https://www.scopus.com/pages/publications/84989298261

U2 - 10.1016/j.nanoen.2016.07.003

DO - 10.1016/j.nanoen.2016.07.003

M3 - 文章

AN - SCOPUS:84989298261

SN - 2211-2855

VL - 27

SP - 167

EP - 174

JO - Nano Energy

JF - Nano Energy

ER -

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

Abstract

UN SDGs

Keywords

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