Nature Communications,
Год журнала:
2025,
Номер
16(1)
Опубликована: Янв. 21, 2025
Ceramic
capacitors
with
ultrahigh
power
density
are
crucial
in
modern
electrical
applications,
especially
under
high-temperature
conditions.
However,
the
relatively
low
energy
limits
their
application
scope
and
hinders
device
miniaturization
integration.
In
this
work,
we
present
a
high-entropy
BaTiO3-based
relaxor
ceramic
outstanding
storage
properties,
achieving
substantial
recoverable
of
10.9
J/cm3
superior
efficiency
93%
at
applied
electric
field
720
kV/cm.
Of
particular
importance
is
that
studied
composition
exhibits
excellent
performance
across
wide
temperature
range
−50
to
260
°C,
variation
below
9%,
additionally,
it
demonstrates
great
cycling
reliability
450
kV/cm
200
°C
up
106
cycles.
Electrical
in-situ
structural
characterizations
revealed
engineered
local
structures
highly
stable
varying
fields,
leading
performance.
This
study
provides
good
paradigm
efficacy
engineering
for
developing
high-performance
dielectric
capacitors.
The
authors
utilize
design
strategy
enhance
capabilities
capacitors,
realizing
from
maintaining
functionality
after
one
million
charge-discharge
cycles
°C.
ACS Applied Energy Materials,
Год журнала:
2024,
Номер
7(5), С. 2030 - 2038
Опубликована: Фев. 29, 2024
Dielectric
energy
storage
ceramics
have
received
significant
attention
as
the
primary
component
for
high-pulse
power
capacitors.
Currently,
their
development
is
limited
by
poor
performance,
which
affects
miniaturization
and
lightweighting
of
electronic
devices.
In
this
study,
a
comprehensive
optimization
approach
was
adopted
to
enhance
performance
(recoverable
density
Wrec
conversion
efficiency
η)
0.8Bi0.5Na0.5TiO3-0.2NaNbO3
(BNT-NN)
through
design
repeated
rolling
process
(RRP).
A
series
Sr(Sc0.5Nb0.5)O3
(SSN)
introduced
into
BNT-NN
modulate
phase
structure
improve
relaxation
properties.
The
applied
refine
grain
dense
property
boost
breakdown
electric
field.
Following
mentioned
strategy,
we
succeeded
in
simultaneously
obtaining
ultrahigh
(∼7.22
J·cm–3)
outstanding
η
(∼95.32%)
under
515
kV·cm–1
0.8(BNT-NN)-0.2SSN
(RRP)
ceramic.
More
importantly,
ceramic
sample
possesses
stability
over
wide
range
temperatures
(25–60
°C)
frequencies
(1–100
Hz).
This
study
proposes
viable
route
better
dielectric
storage,
indicates
its
promising
applicability
high-
high-pulse-power
Inorganic Chemistry Frontiers,
Год журнала:
2024,
Номер
11(14), С. 4187 - 4196
Опубликована: Янв. 1, 2024
Extremely
high
energy
storage
properties
of
PbHfO
3
-based
antiferroelectric
ceramics
were
achieved
through
improved
sample
quality
and
delayed
phase
switching
fields,
along
with
multiple
transitions
induced
by
electrical
field.
Journal of Materiomics,
Год журнала:
2024,
Номер
11(3), С. 100903 - 100903
Опубликована: Июнь 22, 2024
The
electrocaloric
effect
(ECE)
offers
a
pathway
to
environmentally
sustainable
and
easily
miniaturized
refrigeration
technology,
positioning
it
as
front-runner
for
the
next
generation
of
solid-state
cooling
solutions.
This
research
unveils
remarkable
ECE
in
finely
tuned
(Ba0.86Ca0.14)0.98La0.02Ti0.92Sn0.08O3
ceramic,
exhibiting
temperature
shift
(ΔT)
1.6
K
across
more
than
85%
maximum
ΔT
(ΔTmax)
spanning
an
exceptionally
wide
operational
range
92
K.
Our
investigation
on
dielectric
responses
ferroelectric
polarization-electric
field
(P–E)
loops
suggests
that
broad
scope
results
from
fragmentation
extended
domains
into
smaller
polar
nano-regions
(PNRs)
supported
by
PFM
analysis.
Furthermore,
introduction
La
enhances
spontaneous
polarization
significantly
extending
electric
can
be
applied,
facilitating
high-performance
at
ambient
temperature.
study
positions
BaTiO3-based
lead-free
ceramic
alternative
addressing
demands
modern
electronic
components,
marking
significant
stride
toward
next-generation
refrigeration.
Materials Horizons,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
Defect
engineering
improves
breakdown
strength,
reduces
conduction
losses
and
induces
localized
disorder
to
achieve
an
ultra-high
energy
storage
density.
Ceramics International,
Год журнала:
2024,
Номер
50(7), С. 11609 - 11616
Опубликована: Янв. 4, 2024
Solid-state
refrigeration
technology
based
on
electrocaloric
effect
provides
a
cost-effective
and
convenient
approach
for
microelectronic
device
cooling.
However,
the
working
temperature
range
of
materials
is
often
narrow
incommensurate
with
that
required
by
many
devices
including
computer
chips
CPUs.
In
this
work,
span
response
in
BaTiO3
ceramics
were
tuned
simultaneous
introduction
Sr
Hf
(abbreviated
as
BSHT).
Through
rational
variation
content,
not
only
Curie
reduced
to
∼80
°C,
but
also
room-temperature
phase
structure
can
be
effectively
from
single
rhombohedral
coexistence
+
orthorhombic
or
tetragonal
phases.
Relaxor
behavior
BSHT
evident
frequency-dispersion
dielectric
permittivity
increased
relaxor
diffuseness
factor
γ.
Temperature-dependent
Raman
spectra
confirm
Ba0.85Sr0.15Hf0.06Ti0.94O3
(0.6BSHT)
sustain
two-phase
state
over
broad
range.
0.6BSHT
render
large
adiabatic
change
ΔT
0.91
K
under
40
kV
cm−1
∼57
covering
window
most
devices.
Moreover,
shows
excellent
fatigue
endurance,
i.e.,
trivial
degradation
<4.4
%
after
106
cycles.
This
work
demonstrates
BaTiO3-based
remain
one
promising
candidates
compositional
modification
an
effective
route
tune
fulfilling
requirements
practical
applications.
