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

Gibson, QD; Zhao, T; Daniels, LM; Walker, HC; Daou, R; Hébert, S; Zanella, M; ... Rosseinsky, MJ; + view all (2021) Low thermal conductivity in a modular inorganic material with bonding anisotropy and mismatch. Science , Article eabh1619. 10.1126/science.abh1619. (In press). Green open access

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Abstract

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 containing different types of intrinsic chemical interface. BiOCl and Bi2O2Se encapsulate these design principles for longitudinal and transverse modes respectively, and the bulk superlattice material Bi4O4SeCl2 combines these effects by ordering both interface types within its unit cell to reach an extremely low thermal conductivity of 0.1 W K−1 m−1 at room temperature along its stacking direction. This value comes within a factor of four of air. We demonstrated that chemical control of the spatial arrangement of distinct interfaces can synergically modify vibrational modes to minimize thermal conductivity.

Type: Article
Title: Low thermal conductivity in a modular inorganic material with bonding anisotropy and mismatch
Open access status: An open access version is available from UCL Discovery
DOI: 10.1126/science.abh1619
Publisher version: https://doi.org/10.1126/science.abh1619
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/10132207
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