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Research Article | Open Access

Chrysanthemum-like high-entropy diboride nanoflowers: A new class of high-entropy nanomaterials

Da LIU, Honghua LIU, Shanshan NING, Yanhui CHU()
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China
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Abstract

High-entropy nanomaterials have been arousing considerable interest in recent years due to their huge composition space, unique microstructure, and adjustable properties. Previous studies focused mainly on high-entropy nanoparticles, while other high-entropy nanomaterials were rarely reported. Herein, we reported a new class of high-entropy nanomaterials, namely (Ta0.2Nb0.2Ti0.2W0.2Mo0.2)B2 high-entropy diboride (HEB-1) nanoflowers, for the first time. Formation possibility of HEB-1 was first theoretically analyzed from two aspects of lattice size difference and chemical reaction thermodynamics. We then successfully synthesized HEB-1 nanoflowers by a facile molten salt synthesis method at 1423 K. The as-synthesized HEB-1 nanoflowers showed an interesting chrysanthemum-like morphology assembled from numerous well-aligned nanorods with diameters of 20-30 nm and lengths of 100-200 nm. Meanwhile, these nanorods possessed a single-crystalline hexagonal structure of metal diborides and highly compositional uniformity from nanoscale to microscale. In addition, the formation of the as-synthesized HEB-1 nanoflowers could be well interpreted by a classical surface-controlled crystal growth theory. This work not only enriches the categories of high-entropy nanomaterials but also opens up a new research field on high-entropy diboride nanomaterials.

Keywords

high-entropy materialsdiboridesnanomaterialsmolten salt synthesis

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Journal of Advanced Ceramics
Volume 9 Issue 3,
June 2020
Pages 339-348
DOI: 10.1007/s40145-020-0373-x
Cite this article:
LIU D, LIU H, NING S, et al. Chrysanthemum-like high-entropy diboride nanoflowers: A new class of high-entropy nanomaterials. Journal of Advanced Ceramics, 2020, 9(3): 339-348. https://doi.org/10.1007/s40145-020-0373-x
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s40145-020-0373-x.T001Unit cell parameters and bond lengths of the as-synthesized HEB-1 products at 1423 K by XRD refinement and five individual diborides and the "average" values represent the means of five individual diborides

Samplea (Å)c (Å)B-B (Å)M-B (Å)
TaB2 [24]3.0763.2651.8112.467
NbB2 [24]3.1123.2741.7942.443
TiB2 [24]3.0283.2281.7452.357
WB2 [23]3.0233.0571.7412.356
MoB2 [23]3.0053.1731.7332.370
Average3.0483.1991.7642.398
HEB-13.0723.1951.7962.387

s40145-020-0373-x.T002Elemental atomic percentage of the as-synthesized HEB-1 nanoflowers by STEM-EDS analyses

ElementTiWTaNbMoBO
(at%)6.136.025.775.635.5069.941.01

s40145-020-0373-x.T003Unit cell parameters and bond lengths of the as-synthesized HEB-1 products at 1423 K for different holding time by XRD refinement

Samplea (Å)c (Å)B-B (Å)M-B (Å)
10 min3.0673.1901.7882.374
20 min3.0823.2141.8032.417
30 min3.0743.1971.7922.395