• • High entropy materials are defined by configurational entropy ΔS_conf > 1.5R, with medium entropy between 1R and 1.5R, and low entropy below 1R, enabling systematic design of thermoelectric materials with tailored transport properties.
• • Lattice distortion, one of the four core effects, significantly reduces lattice thermal conductivity by enhancing phonon scattering, as demonstrated in high-entropy perovskite oxides achieving glass-like thermal conductivity (e.g., Sr0.9La0.1(Zr0.25Sn0.25Ti0.25Hf0.25)O3) with low thermal conductivity and high Seebeck coefficient.
• • Entropy engineering enables carrier-phonon decoupling, as shown in perovskite thermoelectrics (Zheng et al., Nat Commun 2024), achieving high thermoelectric performance by independently optimizing electrical and thermal transport.
• • High-entropy half-Heusler compounds exhibit temperature and composition insensitivity of thermoelectric properties, indicating robust performance across operational ranges, which is critical for industrial waste heat recovery applications.