Origin of Intrinsically Low Thermal Conductivity in Talnakhite Cu17.6Fe17.6S32 Thermoelectric Material: Correlations between Lattice Dynamics and Thermal Transport

Xie, Hongyao; Su, Xianli; Zhang, Xiaomi; Hao, Shiqiang; Bailey, Trevor P.; Stoumpos, Constantinos C.; Douvalis, Alexios P.; Hu, Xiaobing; Wolverton, Christopher; Dravid, Vinayak P.; Uher, Ctirad; Tang, Xinfeng; Kanatzidis, Mercouri G.

doi:10.1021/jacs.9b05072

Title: Origin of Intrinsically Low Thermal Conductivity in Talnakhite Cu_17.6Fe_17.6S₃₂ Thermoelectric Material: Correlations between Lattice Dynamics and Thermal Transport

Journal Article · 16 June 2019 · Journal of the American Chemical Society

DOI: https://doi.org/10.1021/jacs.9b05072 · OSTI ID:1777380

^[1];

^[1]; Zhang, Xiaomi ^[2];

^[2]; Bailey, Trevor P. ^[3];

^[2]; Douvalis, Alexios P. ^[4];

^[2];

^[2]; Uher, Ctirad ^[3];

^[5];

^[2]

Wuhan Univ. of Technology (China); Northwestern Univ., Evanston, IL (United States)
Northwestern Univ., Evanston, IL (United States)
Univ. of Michigan, Ann Arbor, MI (United States)
Univ. of Ioannina (Greece)
Wuhan Univ. of Technology (China)

Understanding the nature of phonon transport in solids and the underlying mechanism linking lattice dynamics and thermal conductivity is important in many fields, including the development of efficient thermoelectric materials where a low lattice thermal conductivity is required. Herein, we choose the pair of synthetic chalcopyrite CuFeS₂ and talnakhite Cu_17.6Fe_17.6S₃₂ compounds, which possess the same elements and very similar crystal structures but very different phonon transport, as contrasting examples to study the influence of lattice dynamics and chemical bonding on the thermal transport properties. Chemically, talnakhite derives from chalcopyrite by inserting extra Cu and Fe atoms in the chalcopyrite lattice. The CuFeS₂ compound has a lattice thermal conductivity of 2.37 W m^-1 K^-1 at 625 K, while Cu_17.6Fe_17.6S₃₂ features Cu/Fe disorder and possesses an extremely low lattice thermal conductivity of merely 0.6 W m^-1 K^-1 at 625 K, approaching the amorphous limit κmin. Low-temperature heat capacity measurements and phonon calculations point to a large anharmonicity and low Debye temperature in Cu_17.6Fe_17.6S₃₂, originating from weaker chemical bonds. Moreover, Mössbauer spectroscopy suggests that the state of Fe atoms in Cu_17.6Fe_17.6S₃₂ is partially disordered, which induces the enhanced alloy scattering. All of the above peculiar features, absent in CuFeS₂, contribute to the extremely low lattice thermal conductivity of the Cu_17.6Fe_17.6S₃₂ compound.

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Research Organization:: Northwestern Univ., Evanston, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Natural Science Foundation of China; 111 Project of China

Grant/Contract Number:: SC0014520; 51402222; 51172174; 51521001; 51632006; B07040

OSTI ID:: 1777380

Journal Information:: Journal of the American Chemical Society, Vol. 141, Issue 27; ISSN 0002-7863

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 44 works

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Title: Origin of Intrinsically Low Thermal Conductivity in Talnakhite Cu17.6Fe17.6S32 Thermoelectric Material: Correlations between Lattice Dynamics and Thermal Transport

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Title: Origin of Intrinsically Low Thermal Conductivity in Talnakhite Cu_17.6Fe_17.6S₃₂ Thermoelectric Material: Correlations between Lattice Dynamics and Thermal Transport