Journal Article

FZJ-2016-04351

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Investigation into the extremely low thermal conductivity in Ba heavily doped BiCuSeO

Feng, D. ; Zheng, F.FZJ* ; Wu, D. ; Wu, M. ; Li, W. ; Huang, L. ; Zhao, L.-D. ; He, J. (Corresponding author)

2016
Elsevier Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.nanoen.2016.07.003

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.

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Contributing Institute(s):

1. Mikrostrukturforschung (PGI-5)

Research Program(s):

1. 143 - Controlling Configuration-Based Phenomena (POF3-143) (POF3-143)

Appears in the scientific report 2016

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Database coverage:
Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; IF >= 10 ; JCR ; No Authors Fulltext ; SCOPUS ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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