Achieving Low Lattice Thermal Conductivity in Half-Heusler Compound LiCdSb via Zintl Chemistry.

ABSTRACT: Half-Heusler compounds usually possess ultrahigh power factors, while the large thermal conductivity hinders the further optimization of their thermoelectric properties. Herein, from the perspective of material design, a new half-Heusler lattice with low lattice thermal conductivity by using Zintl chemistry based on the composition of LiCdSb is rationally constructed. The weak bonding within the polyanions combined with the resonance vibration modes of Li⁺ contributes to the small lattice thermal conductivity of pristine LiCdSb as low as 3.2 W m^-1K^-1 at 303 K and 0.85 W m^-1K^-1 at 573 K. Ag doping is further conducted for boosting the electronic quality factor B _E from 2.5 to 5.2 μW cm^-1K^-2 due

SUBMITTER: Yang X 

PROVIDER: S-EPMC11936016 | biostudies-literature | 2022 Dec

REPOSITORIES: biostudies-literature