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Synergistic Grain Boundary and Phonon Engineering Enables Ultrahigh Thermoelectric Performance in Mg 3 (Sb, Bi) 2 ‐Based Materials

ABSTRACT Thermoelectric Mg 3 (Sb, Bi) 2 has emerged as a rising star in virtue of its promising thermoelectric performance and abundant constituent elements. However, its practical application is hindered by challenges in synthesis and the strong coupling between electrical and t...