High thermoelectric performance and low thermal conductivity in Cu2−yS1/3Se1/3Te1/3 liquid-like materials with nanoscale mosaic structures

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High thermoelectric performance and low thermal conductivity in Cu2−yS1/3Se1/3Te1/3 liquid-like materials with nanoscale mosaic structures. / Zhao, Kunpeng; Zhu, Chenxi; Qiu, Pengfei; Blichfeld, Anders B.; Eikeland, Espen; Ren, Dudi; Iversen, Bo B.; Xu, Fangfang; Shi, Xun; Chen, Lidong.

I: Nano Energy, Bind 42, 01.12.2017, s. 43-50.

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

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Zhao, Kunpeng ; Zhu, Chenxi ; Qiu, Pengfei ; Blichfeld, Anders B. ; Eikeland, Espen ; Ren, Dudi ; Iversen, Bo B. ; Xu, Fangfang ; Shi, Xun ; Chen, Lidong. / High thermoelectric performance and low thermal conductivity in Cu2−yS1/3Se1/3Te1/3 liquid-like materials with nanoscale mosaic structures. I: Nano Energy. 2017 ; Bind 42. s. 43-50.

Bibtex

@article{8a32fdc45e5d483b9cbaa5bea794950d,
title = "High thermoelectric performance and low thermal conductivity in Cu2−yS1/3Se1/3Te1/3 liquid-like materials with nanoscale mosaic structures",
abstract = "Mosaic-crystal microstructure is one of the optimal strategies for decoupling and balancing thermal and electrical transport properties in thermoelectric materials. Herein, we successfully achieve the desired nanoscale mosaic structures in triple-component Cu2−yS1/3Se1/3Te1/3 solid solutions using Cu2S, Cu2Se, and Cu2Te matrix compounds. They are solved in hexagonal structures with space group R3̅m by means of single crystal structural solution and Rietveld refinement. Electron backscatter diffraction measurements show that all the samples are polycrystalline compounds with the grain size in the range of micrometers. However, transmission electron microscopic study reveals that these microscale grains are quasi-single crystals consist of a variety of 10–30 nm mosaic grains. Each mosaic grain is a perfect crystal but titled or rotated with respect to others by a very small angle. In this case, excellent electrical transports are maintained but exceptional low thermal conductivity is achieved throughout the whole temperature range, which is attributed to the combined phonon scatterings by point defects, liquid-like copper ions, and lattice strains or interfaces of mosaic nanograins. Combining all these favorable factors, remarkably high thermoelectric performance is achieved in Cu1.98S1/3Se1/3Te1/3 with a maximum zT of 1.9 at 1000 K.",
keywords = "Electrical conductivity, Mosaic structure, Solid solution, Thermal conductivity, Thermoelectric",
author = "Kunpeng Zhao and Chenxi Zhu and Pengfei Qiu and Blichfeld, {Anders B.} and Espen Eikeland and Dudi Ren and Iversen, {Bo B.} and Fangfang Xu and Xun Shi and Lidong Chen",
year = "2017",
month = dec,
day = "1",
doi = "10.1016/j.nanoen.2017.10.042",
language = "English",
volume = "42",
pages = "43--50",
journal = "Nano Energy",
issn = "2211-2855",
publisher = "Elsevier BV",

}

RIS

TY - JOUR

T1 - High thermoelectric performance and low thermal conductivity in Cu2−yS1/3Se1/3Te1/3 liquid-like materials with nanoscale mosaic structures

AU - Zhao, Kunpeng

AU - Zhu, Chenxi

AU - Qiu, Pengfei

AU - Blichfeld, Anders B.

AU - Eikeland, Espen

AU - Ren, Dudi

AU - Iversen, Bo B.

AU - Xu, Fangfang

AU - Shi, Xun

AU - Chen, Lidong

PY - 2017/12/1

Y1 - 2017/12/1

N2 - Mosaic-crystal microstructure is one of the optimal strategies for decoupling and balancing thermal and electrical transport properties in thermoelectric materials. Herein, we successfully achieve the desired nanoscale mosaic structures in triple-component Cu2−yS1/3Se1/3Te1/3 solid solutions using Cu2S, Cu2Se, and Cu2Te matrix compounds. They are solved in hexagonal structures with space group R3̅m by means of single crystal structural solution and Rietveld refinement. Electron backscatter diffraction measurements show that all the samples are polycrystalline compounds with the grain size in the range of micrometers. However, transmission electron microscopic study reveals that these microscale grains are quasi-single crystals consist of a variety of 10–30 nm mosaic grains. Each mosaic grain is a perfect crystal but titled or rotated with respect to others by a very small angle. In this case, excellent electrical transports are maintained but exceptional low thermal conductivity is achieved throughout the whole temperature range, which is attributed to the combined phonon scatterings by point defects, liquid-like copper ions, and lattice strains or interfaces of mosaic nanograins. Combining all these favorable factors, remarkably high thermoelectric performance is achieved in Cu1.98S1/3Se1/3Te1/3 with a maximum zT of 1.9 at 1000 K.

AB - Mosaic-crystal microstructure is one of the optimal strategies for decoupling and balancing thermal and electrical transport properties in thermoelectric materials. Herein, we successfully achieve the desired nanoscale mosaic structures in triple-component Cu2−yS1/3Se1/3Te1/3 solid solutions using Cu2S, Cu2Se, and Cu2Te matrix compounds. They are solved in hexagonal structures with space group R3̅m by means of single crystal structural solution and Rietveld refinement. Electron backscatter diffraction measurements show that all the samples are polycrystalline compounds with the grain size in the range of micrometers. However, transmission electron microscopic study reveals that these microscale grains are quasi-single crystals consist of a variety of 10–30 nm mosaic grains. Each mosaic grain is a perfect crystal but titled or rotated with respect to others by a very small angle. In this case, excellent electrical transports are maintained but exceptional low thermal conductivity is achieved throughout the whole temperature range, which is attributed to the combined phonon scatterings by point defects, liquid-like copper ions, and lattice strains or interfaces of mosaic nanograins. Combining all these favorable factors, remarkably high thermoelectric performance is achieved in Cu1.98S1/3Se1/3Te1/3 with a maximum zT of 1.9 at 1000 K.

KW - Electrical conductivity

KW - Mosaic structure

KW - Solid solution

KW - Thermal conductivity

KW - Thermoelectric

UR - http://www.scopus.com/inward/record.url?scp=85032013733&partnerID=8YFLogxK

U2 - 10.1016/j.nanoen.2017.10.042

DO - 10.1016/j.nanoen.2017.10.042

M3 - Journal article

AN - SCOPUS:85032013733

VL - 42

SP - 43

EP - 50

JO - Nano Energy

JF - Nano Energy

SN - 2211-2855

ER -