Low thermal conductivity in a modular inorganic material with bonding anisotropy and mismatch

Gibson, Quinn D, Zhao, Tianqi, Daniels, Luke M ORCID: 0000-0002-7077-6125, Walker, Helen C, Daou, Ramzy, Hebert, Sylvie, Zanella, Marco ORCID: 0000-0002-6164-6169, Dyer, Matthew S ORCID: 0000-0002-4923-3003, Claridge, John B ORCID: 0000-0003-4849-6714, Slater, Ben
et al (show 4 more authors) (2021) Low thermal conductivity in a modular inorganic material with bonding anisotropy and mismatch. SCIENCE, 373 (6558). 1017-+.

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The thermal conductivity of crystalline materials cannot be arbitrarily low, as the intrinsic limit depends on the phonon dispersion. We used complementary strategies to suppress the contribution of the longitudinal and transverse phonons to heat transport in layered materials that contain different types of intrinsic chemical interfaces. BiOCl and Bi<sub>2</sub>O<sub>2</sub>Se encapsulate these design principles for longitudinal and transverse modes, respectively, and the bulk superlattice material Bi<sub>4</sub>O<sub>4</sub>SeCl<sub>2</sub> combines these effects by ordering both interface types within its unit cell to reach an extremely low thermal conductivity of 0.1 watts per kelvin per meter at room temperature along its stacking direction. This value comes within a factor of four of the thermal conductivity of air. We demonstrated that chemical control of the spatial arrangement of distinct interfaces can synergically modify vibrational modes to minimize thermal conductivity.

Item Type: Article
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 08 Dec 2021 15:38
Last Modified: 17 Apr 2023 09:47
DOI: 10.1126/science.abh1619
Open Access URL: https://discovery.ucl.ac.uk/id/eprint/10132207/
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3144978