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One‐step synthesis of coral‐like high‐entropy metal carbide powders
Author(s) -
Ye Beilin,
Ning Shanshan,
Liu Da,
Wen Tongqi,
Chu Yanhui
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16514
Subject(s) - carbide , materials science , carbothermic reaction , metal , microscale chemistry , chemical engineering , hexagonal crystal system , particle size , nanotechnology , metallurgy , crystallography , chemistry , mathematics education , mathematics , engineering
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 (Zr 0.25 Ta 0.25 Nb 0.25 Ti 0.25 )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 μm 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.