Broader context Due to the countless combinations of compositions and processes, the world of high-entropy materials is brimming with opportunities, both in academic research and practical applications, including the field of thermoelectrics. ![]() This study highlights the role of an adaptable sublattice in stabilizing high-entropy materials and offers a new pathway for exploring high-performance thermoelectric materials. A maximum zT value of 1.3 is finally realized at 700 K in Mg 2− δSi 0.12Ge 0.13Sn 0.73Bi 0.02, which is among the top values of all Mg 2X-based materials. Additionally, the interplay between the substitutional Bi Sn defects and self-compensational Mg vacancies leads to an optimized carrier concentration and thereby high power factors. The resulting ultralow lattice thermal conductivity of 0.58 W m −1 K −1 at 800 K is not only approaching the amorphous limit but also lower than that of all known Mg 2X-based materials. Taking Mg 2− δ(Si, Ge, Sn, Bi) as a case study, the loosely bonded Mg sublattice is featured with large dynamic adaptability or flexibility, enabling it to release the large lattice strains caused by the large atomic size mismatch among Si, Ge, Sn and Bi. Furthermore, the electrical and thermal transports can be efficiently tuned for much enhanced thermoelectric performance. Herein, we propose that the adaptable sublattice can effectively stabilize single-phase high-entropy materials. ![]() However, the presence of multiple elements with different atomic sizes and electronegativities in high-entropy materials often results in phase separation instead of the formation of a single phase. E-mail: engineering is considered one of the most promising strategies in materials science, including the field of thermoelectrics. E-mail: b Wuzhen Laboratory, Tongxiang, 314500, China c State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Micro-System and Information Technology, Chinese Academy of Sciences, 200050 Shanghai, China d Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China e State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China. * ae a State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China. Sci., 2023, 16, 6046-6057 Adaptable sublattice stabilized high-entropy materials with superior thermoelectric performance †
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |