Extremely low lattice thermal conductivity in light-element solid materials.

ABSTRACT: Lattice thermal conductivity (κ _l) is of great importance in basic sciences and in energy conversion applications. However, low-κ _l crystalline materials have only been obtained from heavy elements, which typically exhibit poor stability and possible toxicity. Thus, low-κ _l materials composed of light elements should be explored. Herein, light elements with hierarchical structures in a simple square-net lattice as well as a small discrepancy in atomic mass and radius exhibit low κ _l. The hierarchical structure exhibits various chemical bonds and asymmetric geometry of building units, resulting in flat phonon branches and strong phonon-phonon interactions similar to those observed in heavy-element materials. These pheno

SUBMITTER: Ma N 

PROVIDER: S-EPMC11702647 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature