Improvement of the Thermoelectric Properties of p-Type Mg3Sb2 by Mg-Site Double Substitution.
Inorg Chem
; 2024 Apr 30.
Article
em En
| MEDLINE
| ID: mdl-38687967
ABSTRACT
A P-type Mg3Sb2-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 Mg2.995Na0.005Sb2 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 â¼1.1 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 Mg1.49Eu0.5Cd1Na0.01Sb2 was further reduced to â¼0.45 W m-1 K-1. Eventually, a peak zT as high as â¼1.0 was achieved at 773 K, and the compound outperforms the previously reported p-type Mg3Sb2 compounds.
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MEDLINE
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Ano de publicação:
2024
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Article