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.
Modern Physics Letters B,
Год журнала:
2025,
Номер
unknown
Опубликована: Май 27, 2025
High-entropy
ceramics
(HECs)
are
widely
studied
to
boost
the
properties
of
various
materials,
based
on
high-entropy
effects
and
high
disorders
in
ionic
radius
atomic
weights.
To
further
optimize
RETaO
4
(RE
is
rare-earth)
as
thermal
barrier
coatings
(TBCs),
a
diatomic
site
engineering
applied
increase
their
disorders,
subsequently
boosting
thermophysical
properties.
Four
HECs
designed
synthesized
this
work,
including
(Gd[Formula:
see
text]Dy[Formula:
text]Ho[Formula:
text]Er[Formula:
text]Y[Formula:
text](Ta[Formula:
text]Nb[Formula:
text]O
,
(5HECs-1),
text]Yb[Formula:
(5HECs-2),
(6HECs-1),
text]Lu[Formula:
(6HECs-2).
It
shows
that
conductivity
(1.41–1.59
W[Formula:
text]m[Formula:
text]K[Formula:
text],
[Formula:
text]C)
reduced,
while
expansion
coefficients
improved
([Formula:
text]–[Formula:
text]
at
text]C),
which
better
than
single-RE
ceramics.
Furthermore,
Young’s
modulus
proportional
A-site
radius,
have
higher
RENbO
Accordingly,
effective
strategy
can
be
tried
oxide
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.
