Improvement of the Thermoelectric Properties of p-Type Mg 3 Sb 2 by Mg-Site Double Substitution.

A P-type Mg 3 Sb 2 -based Zintl phase compound has been considered a promising candidate for thermoelectric applications. Alloying, which introduces a high concentration of point defects, is particularly effective in scattering phonons and reducing lattice thermal conductivity. Herein, alloying in p-type Mg 2.995 Na 0.005 Sb 2 via the introduction of elements like Yb, Eu, Ca, and Ba was realized, and the room-temperature lattice thermal conductivity has been effectively reduced to ∼1.1 W m -1 K -1 . To further intensify the phonon scattering, two groups of elements (Eu and Cd, and Yb and Cd) were chosen for heavy alloying at the Mg site, and the lattice thermal conductivity of Mg 1.49 Eu 0.5 Cd 1 Na 0.01 Sb 2 was further reduced to ∼0.45 W m -1 K -1 . Eventually, a peak zT as high as ∼1.0 was achieved at 773 K, and the compound outperforms the previously reported p-type Mg 3 Sb 2 compounds.