期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 103, 期 3, 页码 2244-2251出版社
WILEY
DOI: 10.1111/jace.16896
关键词
first-principle calculations; high-entropy carbides; molten salt synthesis; powders; solid solutions
资金
- National Natural Science Foundation of China [51802100, 51972116]
- National Key Research and Development Program of China [2017YFB0703200]
- Young Elite Scientists Sponsorship Program by CAST [2017QNRC001]
Synthesis of the powders is critical for achieving the extensive applications of high-entropy carbides (HECs). Previously reported studies focus mainly on the high-temperature (>2000 K) synthesis of HEC micro/submicropowder, while the low-temperature synthesis of HEC nanopowders is rarely studied. Herein we reported the low-temperature synthesis of HEC nanopowders, namely (Ta0.25Nb0.25Ti0.25V0.25)C (HEC-1), via molten salt synthesis for the first time. The synthesis possibility of HEC-1 nanopowders was first theoretically demonstrated by analyzing lattice size difference and chemical reaction thermodynamics based on the first-principle calculations, and then the angular HEC-1 nanopowders were successfully synthesized via molten salt synthesis at 1573 K. The as-synthesized nanopowders possessed the single-crystal rock-salt structure of metal carbides and high compositional uniformity from nanoscale to microscale. In addition, their formation mechanism was well interpreted by a classical molten salt-assisted growth.
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