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).
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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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