Advanced Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 28, 2024
Abstract
Dielectric
oxides
with
robust
relaxation
responses
are
fundamental
for
electronic
devices
utilized
in
energy
absorption,
conversion,
and
storage.
However,
the
structural
origins
governing
dielectric
response
remain
elusive
due
to
involvement
of
atomically
complex
compositional
environments.
Herein,
configurational
entropy
is
introduced
as
a
regulatory
factor
precisely
control
heterogeneity
representative
perovskite
oxides.
Through
advanced
electric
field
visualization
studies,
novel
quantitative
relationship
established
between
atomic‐level
disorder‐induced
polarization
macroscopic
properties.
The
results
indicate
that
degree
atomic
delocalization
exhibits
near‐parabolic
trend
increasing
entropy,
reaching
maximum
medium‐entropy
perovskite.
Correspondingly,
vectors
display
significant
asymmetrical
distribution,
thus
greatly
enhancing
angstrom‐scale
polarization.
Then,
it
experimentally
proven
entropy‐driven
can
improve
behavior
characterized
by
broader
frequency
stronger
intensity
electromagnetic
improvements
approximately
160%
413%
compared
structurally
homogeneous
control.
This
study
unveils
correlation
oxides,
offering
perspective
exploring
structure–property
materials.
Energy & Environmental Science,
Год журнала:
2024,
Номер
unknown
Опубликована: Янв. 1, 2024
An
overview
of
high-entropy
strategies
for
batteries
is
provided,
emphasizing
their
unique
structural/compositional
attributes
and
positive
effects
on
stability
performance,
alongside
a
discussion
key
challenges
future
research
directions.
Nanomaterials,
Год журнала:
2025,
Номер
15(8), С. 571 - 571
Опубликована: Апрель 8, 2025
High-entropy
oxides
are
a
new
type
of
material
that
consists
five
or
more
principal
elements
in
an
equimolar
nearly
ratio.
They
have
many
excellent
properties
and
rapidly
becoming
hotspot
for
the
development
high-performance
materials.
In
this
study,
electrical
explosion
is
used
first
time
to
synthesize
high-entropy
oxide
nanopowders
with
different
crystal
structures.
(FeCoNiCrCu)O
rock
salt
structure,
(FeCoNiCrTi)O
spinel
(CoNiTiCuZn)O
contains
two
phases.
According
TEM
EDS
results,
distribution
metal
products
comparatively
homogeneous,
particle
size
concentrated
20-40
nm.
Elements
such
as
Ti
prone
formation
element
Cu
structure.
The
study
shows
wires
method
synthesis
nanopowders.
Journal of the American Ceramic Society,
Год журнала:
2025,
Номер
unknown
Опубликована: Май 6, 2025
Abstract
In
this
study,
a
series
of
high‐entropy
(Ca,
Sr,
Ba)[Ti,
(Mg
1/3
Nb
2/3
)]O
3
ceramics
were
fabricated
through
solid‐state
reaction.
Systematic
investigations
conducted
to
examine
the
effects
varying
configurational
entropy
(
S
conf
)
values
on
crystal
structure,
microstructural
evolution,
and
microwave
dielectric
performance.
All
samples
sintered
at
temperatures
ranging
from
1390°C
1490°C
exhibited
single‐phase
perovskite
structures
within
Pbnm
space
group.
By
employing
P
‒
V
L
complex
chemical
bonding
theory,
we
calculated
bond
ionicity,
lattice
energy,
energy
elucidate
influence
configurations
properties.
The
results
indicated
that
constant
ε
r
strong
correlation
with
relative
density,
ionic
polarizability
as
increased.
Notably,
demonstrated
superior
quality
factor
Q
×
f
compared
their
low‐entropy
counterparts,
primarily
due
synergistic
refinement,
grain
size
control.
Furthermore,
design
induced
pronounced
[TiO
6
]
octahedral
distortion,
leading
significantly
reduced
temperature
coefficient
resonant
frequency
τ
conventional
Sr)TiO
‐based
ceramics.
optimal
composition
=
1.71
R
),
1450°C
for
2
h,
achieved
exceptional
properties:
54.23
±
0.61,
16
286
252
GHz,
17.49
1.12
ppm/°C.
