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Title: Thermoelectric properties of copper selenide with ordered selenium layer and disordered copper layer

Abstract

Thermoelectric figure-of-merit (ZT) of ~1.6 at 700 °C is achieved in β-phase copper selenide (Cu 2Se) made by ball milling and hot pressing. The β-phase of such material possesses a natural superlattice-like structure that combines ordered selenium (Se) and disordered copper (Cu) layers in its unit cell, resulting in a low lattice thermal conductivity of 0.4–0.5 W m -1 K -1. A λ-shaped specific heat peak indicates a phase transition from cubic β-phase to tetragonal α-phase at around 140 °C upon cooling and vice versa. An abnormal decrease in specific heat with increasing temperature was also observed here due to the increased random motion of disordered Cu atoms. These features indicate that β-phase Cu 2Se could be potentially an interesting thermoelectric material, competing with other conventional thermoelectric materials.

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [1]
  1. Boston College, Chestnut Hill, MA (United States). Dept. of Physics
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Mechanical Engineering
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1386802
Grant/Contract Number:  
SC0001299
Resource Type:
Accepted Manuscript
Journal Name:
Nano Energy
Additional Journal Information:
Journal Volume: 1; Journal Issue: 3; Journal ID: ISSN 2211-2855
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; copper selenide; thermoelectrics; ordered and disordered layers; natural superlattice; specific heat

Citation Formats

Yu, Bo, Liu, Weishu, Chen, Shuo, Wang, Hui, Wang, Hengzhi, Chen, Gang, and Ren, Zhifeng. Thermoelectric properties of copper selenide with ordered selenium layer and disordered copper layer. United States: N. p., 2012. Web. doi:10.1016/j.nanoen.2012.02.010.
Yu, Bo, Liu, Weishu, Chen, Shuo, Wang, Hui, Wang, Hengzhi, Chen, Gang, & Ren, Zhifeng. Thermoelectric properties of copper selenide with ordered selenium layer and disordered copper layer. United States. doi:10.1016/j.nanoen.2012.02.010.
Yu, Bo, Liu, Weishu, Chen, Shuo, Wang, Hui, Wang, Hengzhi, Chen, Gang, and Ren, Zhifeng. Tue . "Thermoelectric properties of copper selenide with ordered selenium layer and disordered copper layer". United States. doi:10.1016/j.nanoen.2012.02.010. https://www.osti.gov/servlets/purl/1386802.
@article{osti_1386802,
title = {Thermoelectric properties of copper selenide with ordered selenium layer and disordered copper layer},
author = {Yu, Bo and Liu, Weishu and Chen, Shuo and Wang, Hui and Wang, Hengzhi and Chen, Gang and Ren, Zhifeng},
abstractNote = {Thermoelectric figure-of-merit (ZT) of ~1.6 at 700 °C is achieved in β-phase copper selenide (Cu2Se) made by ball milling and hot pressing. The β-phase of such material possesses a natural superlattice-like structure that combines ordered selenium (Se) and disordered copper (Cu) layers in its unit cell, resulting in a low lattice thermal conductivity of 0.4–0.5 W m-1 K-1. A λ-shaped specific heat peak indicates a phase transition from cubic β-phase to tetragonal α-phase at around 140 °C upon cooling and vice versa. An abnormal decrease in specific heat with increasing temperature was also observed here due to the increased random motion of disordered Cu atoms. These features indicate that β-phase Cu2Se could be potentially an interesting thermoelectric material, competing with other conventional thermoelectric materials.},
doi = {10.1016/j.nanoen.2012.02.010},
journal = {Nano Energy},
number = 3,
volume = 1,
place = {United States},
year = {2012},
month = {3}
}

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Works referencing / citing this record:

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  • Shi, Yixuan; Mashmoushi, Nour; Wegner, Wojciech
  • Journal of Materials Chemistry C, Vol. 7, Issue 26
  • DOI: 10.1039/c9tc02029b