Low Thermal Conductivity in Single Crystalline Mg₃Bi₂ and Its Thermopower Enhanced by Electron-Phonon Interaction.

ABSTRACT: Promising thermoelectric materials are usually those of "phonon-glass electron-crystal" (PGEC) compounds, with low thermal conductivity and high carrier mobility. In metallic materials, strong electron-phonon interaction usually causes an increase of Seebeck coefficient (S) at low temperature, due to an extra electrical current driven by heat-carrying phonons, named phonon drag effect. Here, this study reports that single crystalline metallic Mg₃Bi₂ has low lattice thermal conductivity of ≈0.49 W m^-1 K^-1 at 285 K, and corresponding mean free path of phonons (L_ph) is ≈0.48 nm, with carrier mobility of ≈54.2 cm² V^-1 s^-1 around room temperature. It is found that S exhibits an increase as a "hump" ≈20 K, an

SUBMITTER: Feng Q 

PROVIDER: S-EPMC12165069 | biostudies-literature | 2025 Jun

REPOSITORIES: biostudies-literature