English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Insulating materials featuring ultralow thermal conductivity for diverseapplications also require robust mechanical properties. Conventional thinking,however, which correlates strong bonding with high atomic-vibration-mediatedheat conduction, led to diverse weakly bonded materials that feature ultralowthermal conductivity and low elastic moduli. One must, therefore, search forstrongly-bonded materials in which heat transport is impeded by other means.Here, we report intrinsic, glass-like, ultralow thermal conductivity andultrahigh elastic-modulus/thermal-conductivity ratio in single-crystalline,BaZrS3-derived, Ruddlesden-Popper phases Ban+1ZrnS3n+1, n = 2, 3. Their keyfeatures are strong anharmonicity and intra-unit-cell rock-salt blocks. Thelatter produce strongly bonded intrinsic superlattices, impeding heatconduction by broadband reduction of phonon velocities and mean free paths andconcomitant strong phonon localization. The present study initiates a paradigmof "mechanically stiff phonon glasses".

Ruddlesden-Popper chalcogenides push the limit of mechanical stiffness and glass-like thermal conductivity in crystals