Nanocrystalline high-entropy hexaboride ceramics enable remarkable performance as thermionic emission cathodes.

ABSTRACT: The development of high-entropy borides with combined structural and functional performance holds untold scientific and technological potential, yet relevant studies have been rarely reported. In this work, we report nanocrystalline (La_0.25Ce_0.25Nd_0.25Eu_0.25)B₆ high-entropy rare-earth hexaboride (HEReB₆-1) ceramics fabricated through the high-pressure sintering of self-synthesized nanopowders for the first time. The as-fabricated samples exhibited a highly dense (96.3%) nanocrystalline (94 nm) microstructure with major (001) fiber textures and good grain boundaries without any impurities, resulting in a remarkable mechanical, electrical, and thermionic emission performance. The results showed that the samples possessed outst

SUBMITTER: Ma M 

PROVIDER: S-EPMC11197715 | biostudies-literature | 2023 Nov

REPOSITORIES: biostudies-literature