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Issue 34, 2013
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Cu–Bi–Se-based pavonite homologue: a promising thermoelectric material with low lattice thermal conductivity

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Abstract

Pavonite homologues, Cux+yBi5−ySe8 (1.2 ≤ x ≤ 1.5, 0.1 ≤ y ≤ 0.4), in a polycrystalline bulk form have been synthesized using a conventional solid state sintering technique. Their thermal and electronic transport properties were evaluated for mid-temperature thermoelectric power generation applications. Structural complexity, based on unique substitutional and interstitial Cu atoms in the structure, makes this system attractive as an intrinsic low thermal conductivity material; also the band structure calculations revealed that interstitial Cu atoms generate n-type carrier conduction. Room temperature lattice thermal conductivities ranging between 0.41 W m−1 K−1 and 0.55 W m−1 K−1 were found for Cux+yBi5−ySe8; these values are comparable to those of the state-of-the-art low lattice thermal conductivity systems. These extremely low thermal conductivities combined with the power factors result in the highest ZT = 0.27 at 560 K for Cu1.9Bi4.6Se8.

Graphical abstract: Cu–Bi–Se-based pavonite homologue: a promising thermoelectric material with low lattice thermal conductivity

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Publication details

The article was received on 11 Apr 2013, accepted on 05 Jun 2013 and first published on 05 Jun 2013


Article type: Paper
DOI: 10.1039/C3TA11457K
Citation: J. Mater. Chem. A, 2013,1, 9768-9774
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    Cu–Bi–Se-based pavonite homologue: a promising thermoelectric material with low lattice thermal conductivity

    J. Y. Cho, H. Mun, B. Ryu, S. I. Kim, S. Hwang, J. W. Roh, D. J. Yang, W. H. Shin, S. M. Lee, S. Choi, D. J. Kang, S. W. Kim and K. H. Lee, J. Mater. Chem. A, 2013, 1, 9768
    DOI: 10.1039/C3TA11457K

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