Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chrysanthemum-like high-entropy diboride nanoflowers: A new class of
  high-entropy nanomaterials   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
(Ta0.2Nb0.2Ti0.2W02Mo0.2)B2 high-entropy diboride (HEB-1) nanoflowers, for the
first time. The 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 1473 K. The as-synthesized HEB-1 nanoflowers
showed an interesting chrysanthemum-like morphology assembled from numerous
well-aligned nanorods with the 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 the high-entropy
diboride nanomaterials.

28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th