Glassy thermal conductivity in Cs₃Bi₂I₆Cl₃ single crystal.

ABSTRACT: As the periodic atomic arrangement of a crystal is made to a disorder or glassy-amorphous system by destroying the long-range order, lattice thermal conductivity, κ_L, decreases, and its fundamental characteristics changes. The realization of ultralow and unusual glass-like κ_L in a crystalline material is challenging but crucial to many applications like thermoelectrics and thermal barrier coatings. Herein, we demonstrate an ultralow (~0.20 W/m·K at room temperature) and glass-like temperature dependence (2-400 K) of κ_L in a single crystal of layered halide perovskite, Cs₃Bi₂I₆Cl₃. Acoustic phonons with low cut-off frequency (20 cm^-1) are responsible for the low sound velocity in Cs₃Bi_2</

SUBMITTER: Acharyya P 

PROVIDER: S-EPMC9420152 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature