Avoided Crossing Phonons Realizes High-Performance Single-Crystalline β-Zn 4 Sb 3 Thermoelectrics.

Autor: Jen IL; Department of Materials Science and Engineering, National Taiwan University, Taipei, 10617, Taiwan.; Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu, 30010, Taiwan., Lin CY; Department of Applied Physics, Tunghai University, Taichung, 407224, Taiwan., Wang KK; Department of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan., Wu CM; National Synchrotron Radiation Research Center, Hsinchu, 300092, Taiwan., Lee CH; Department of Applied Physics, Tunghai University, Taichung, 407224, Taiwan., Wu HJ; Department of Materials Science and Engineering, National Taiwan University, Taipei, 10617, Taiwan.; Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu, 30010, Taiwan.
Jazyk: angličtina
Zdroj: Advanced science (Weinheim, Baden-Wurttemberg, Germany) [Adv Sci (Weinh)] 2024 Dec 11, pp. e2411498. Date of Electronic Publication: 2024 Dec 11.
DOI: 10.1002/advs.202411498
Abstrakt: This study reveals the mechanisms behind the ultralow lattice thermal conductivity κ L in β-Zn 4 Sb 3 single crystals through inelastic neutron scattering (INS). Analyzing phonon behaviors and the interaction between acoustic phonons and rattling modes, the first experimental evidence of avoided crossing in β-Zn 4 Sb 3 is provided. The rattler-phonon avoided crossings contribute to the low κ L in a β-Zn 4 Sb 3 single crystal, enhancing the thermoelectric figure-of-merit (zT). TEM characterizations of the β-Zn 4 Sb 3 single crystal with intrinsic and ultralow κ L reveal a grain-boundary-free structure with uniformly dispersed rotation moiré fringes that contribute to low lattice thermal conductivity while maintaining a uniform elemental distribution. Additionally, the significant impact of crystallinity control coupled with dilute doping on boosting thermoelectric performance, with single-crystalline single leg outperforming their polycrystalline counterparts is demonstrated. Notably, the conversion efficiency η of the undoped β-Zn 4 Sb 3 single leg achieves 1.4% under a temperature gradient of 200 K.
(© 2024 The Author(s). Advanced Science published by Wiley‐VCH GmbH.)
Databáze: MEDLINE
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