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- Title
NaCdSb: An Orthorhombic Zintl Phase with Exceptional Intrinsic Thermoelectric Performance.
- Authors
Guo, Kai; Zhang, Yuting; Yuan, Song; Tang, Qinghang; Lin, Chen; Luo, Pengfei; Yang, Jiong; Pan, Shusheng; Zhao, Li‐Dong; Cheng, Guofeng; Zhang, Jiye; Luo, Jun
- Abstract
Many Zintl phases are promising thermoelectric materials owning to their features like narrow band gaps, multiband behaviors, ideal charge transport tunnels, and loosely bound cations. Herein we show a new Zintl phase NaCdSb with exceptional intrinsic thermoelectric performance. Pristine NaCdSb exhibits semiconductor behaviors with an experimental hole concentration of 2.9×1018 cm−3 and a calculated band gap of 0.5 eV. As the temperature increases, the hole concentration rises gradually and approaches its optimal one, leading to a high power factor of 11.56 μW cm−1 K−2 at 673 K. The ultralow thermal conductivity is derived from the small phonon group velocity and short phonon lifetime, ascribed to the structural anharmonicity of Cd−Sb bonds. As a consequence, a maximum zT of 1.3 at 673 K has been achieved without any doping optimization or structural modification, demonstrating that NaCdSb is a remarkable thermoelectric compound with great potential for performance improvement.
- Subjects
ZINTL compounds; THERMOELECTRIC materials; STRUCTURAL optimization; GROUP velocity; THERMAL conductivity; ANHARMONIC motion
- Publication
Angewandte Chemie, 2023, Vol 135, Issue 3, p1
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202212515