Journal
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 102, Issue 10, Pages 6372-6378Publisher
WILEY
DOI: 10.1111/jace.16514
Keywords
carbothermal reduction; first-principle calculations; high-entropy metal carbides; screw dislocation growth; solid solutions
Categories
Funding
- National Key Research and Development Program of China [2017YFB0703200]
- Young Elite Scientists Sponsorship Program by CAST [2017QNRC001]
- National Natural Science Foundation of China [51802100]
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The synthesis of high-entropy metal carbide powders is critical for implementing their extensive applications. However, the one-step synthesis of high-entropy metal carbide powders is rarely studied. Herein, the synthesis possibility of high-entropy metal carbide powders, namely (Zr0.25Ta0.25Nb0.25Ti0.25)C (ZTNTC), via one-step carbothermal reduction was first investigated theoretically by analyzing chemical thermodynamics and lattice size difference based on the first-principle calculations, and then the ZTNTC powders with particle size of 0.5-2 mu m were successfully synthesized experimentally. The as-synthesized powders not only had a single rock-salt crystal structure of metal carbides, but also possessed high-compositional uniformity from nanoscale to microscale. More interestingly, they exhibited the distinguished coral-like morphology with the hexagonal step surface, whose growth was governed by a classical screw dislocation growth mechanism.
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