Lattice Overdamping Induced Anisotropy Decoupling of Phonon and Carrier Transports in Quasi‐1D KCu7S4 Textured Materials DOI
Yao Chen, Zizhen Zhou, Bin Zhang

и другие.

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Апрель 30, 2025

Abstract A diversity of inorganic semiconductors with quasi‐low‐dimensional structures are promising thermoelectrics due to their intrinsically low lattice thermal conductivity. However, electrical and conductions for such materials commonly facilitated by the same preferential microstructural orientation, hindering improvement thermoelectric performance. Herein, higher conductivity yet lower (e.g., 0.48 W m −1 K at 721 K) is demonstrated in polycrystalline, quasi‐1D KCu 7 S 4 along direction perpendicular pressing (possessing texturing 1D chains). Theoretical calculations based on unified phonon transport theory reveal that wave‐like coherences play a dominant role overdamped turn alter conventional anisotropy conductivity, which originates from strong rattling anharmonicity loose, tilted Cu–S triangular coordination, narrow inter‐band spacings, extrinsic phonon‐defects scattering. Ultimately, anomalous contributes ≈100% increase maximum dimensionless figure merit compared attained parallel pressing. This work demonstrates efficacy engineering decoupling transports develop advanced materials.

Язык: Английский

Lattice Overdamping Induced Anisotropy Decoupling of Phonon and Carrier Transports in Quasi‐1D KCu7S4 Textured Materials DOI
Yao Chen, Zizhen Zhou, Bin Zhang

и другие.

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Апрель 30, 2025

Abstract A diversity of inorganic semiconductors with quasi‐low‐dimensional structures are promising thermoelectrics due to their intrinsically low lattice thermal conductivity. However, electrical and conductions for such materials commonly facilitated by the same preferential microstructural orientation, hindering improvement thermoelectric performance. Herein, higher conductivity yet lower (e.g., 0.48 W m −1 K at 721 K) is demonstrated in polycrystalline, quasi‐1D KCu 7 S 4 along direction perpendicular pressing (possessing texturing 1D chains). Theoretical calculations based on unified phonon transport theory reveal that wave‐like coherences play a dominant role overdamped turn alter conventional anisotropy conductivity, which originates from strong rattling anharmonicity loose, tilted Cu–S triangular coordination, narrow inter‐band spacings, extrinsic phonon‐defects scattering. Ultimately, anomalous contributes ≈100% increase maximum dimensionless figure merit compared attained parallel pressing. This work demonstrates efficacy engineering decoupling transports develop advanced materials.

Язык: Английский

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