Journal of the European Ceramic Society,
Journal Year:
2024,
Volume and Issue:
44(7), P. 4332 - 4349
Published: Feb. 8, 2024
Dielectric
electrostatic
capacitors
are
breakthroughs
in
energy
storage
applications
such
as
pulsed
power
(PPAs)
and
miniaturized
energy-autonomous
systems
(MEASs).
Low
density,
poor
charge-discharge
speed,
deprived
breakdown
strength
of
batteries
electrochemical
limit
their
use
various
implantable,
wearable,
portable
electronics.
Recently,
relaxor
ferroelectric
(RFE)
anti-ferroelectric
(AFE)
thin
film
have
emerged
appropriate
candidates
for
PPAs
MEASs.
High
density
(50-120
J/cm3),
large
(109-1010
W/kg),
ultrafast
speed
(μs
range),
superior
dielectric
(DBS)
(~MV/cm),
excellent
thermal
stability
(150-275
oC)
RFE
AFE
high
electronic
device
applications.
In
this
review
article,
we
portray
a
succinct
discussion
the
properties
AFE-based
films.
ACS Applied Energy Materials,
Journal Year:
2024,
Volume and Issue:
7(15), P. 6515 - 6526
Published: July 25, 2024
AgNbO3
(AN)-based
lead-free
antiferroelectric
(AFE)
ceramic
materials
have
garnered
significant
research
attention
due
to
their
distinctive
AFE
structures
and
potential
applications
in
pulse
dielectric
capacitor
devices.
However,
inferior
energy
storage
performance
(ESP)
has
hindered
further
advancements
practical
use.
To
address
this
challenge,
we
introduce
a
synergistic
optimization
strategy
aimed
at
enhancing
the
ESP
of
AN-based
ceramics.
Initially,
incorporate
Bi3+
ions
into
A-site
Ta5+
B-site
ABO3-structured
AN
crystal
lattice.
This
deliberate
modification
leverages
smaller
radius
compared
Ag+
ions,
effectively
reducing
tolerance
factor
oxygen
octahedral
torsion,
thereby
stabilizing
phase.
Additionally,
hybridization
ions'
6s
orbitals
with
O2–
2p
amplifies
polarization.
By
finely
adjusting
Nb5+/Ta5+
ion
concentration
ratio
control
paraelectric
phase
content,
regulate
electric
field-induced
polarization
its
response
trajectory,
ultimately
improving
while
minimizing
hysteresis.
Comprehensive
characterization
(Ag0.955Bi0.015)(Nb1–xTax)O3
ceramics
was
performed
through
X-ray
diffraction
refinement,
temperature-dependent
properties,
transmission
electron
microscopy,
revealing
intricate
interplay
between
atoms,
structure,
properties.
Our
investigation
culminates
demonstrating
an
ultrahigh
recoverable
density
7.06
J/cm3
efficiency
75%
470
kV/cm
(Ag0.955Bi0.015)(Nb0.75Ta0.25)O3
ceramics,
accompanied
by
exceptional
temperature
stability
from
room
140
°C.
systematic
lays
groundwork
for
fabricating
capacitors
enhanced
strategy.
Materials Horizons,
Journal Year:
2024,
Volume and Issue:
11(7), P. 1732 - 1740
Published: Jan. 1, 2024
The
restricted
energy
density
in
dielectric
ceramic
capacitors
is
challenging
for
their
integration
with
advanced
electronic
systems.
Numerous
strategies
have
been
proposed
to
boost
the
at
different
scales
or
combine
those
multiscale
effects.
Herein,
guided
by
all-scale
synergistic
design,
we
fabricated
Sr
Small,
Journal Year:
2024,
Volume and Issue:
unknown
Published: June 12, 2024
Abstract
High‐performance
energy
storage
dielectrics
capable
of
low/moderate
field
operation
are
vital
in
advanced
electrical
and
electronic
systems.
However,
contrast
to
achievements
enhancing
recoverable
density
(
W
rec
),
the
active
realization
superior
efficiency
η
)
with
giant
energy‐storage
coefficient
/
E
electric
regions
is
much
more
challenging
for
dielectric
materials.
Herein,
lead‐free
relaxor
ferroelectrics
reported
designed
polymorphic
heterogeneous
polar
structure.
Following
guidance
Landau
phenomenological
theory
rational
composition
construction,
conceived
(Bi
0.5
Na
)TiO
3
‐based
ternary
solid
solution
that
delivers
≈0.0168
µC
cm
−2
,
high
≈4.71
J
−3
≈93%
under
low
280
kV
−1
accompanied
by
great
stabilities
against
temperature/frequency/cycling
number
excellent
charging–discharging
properties,
which
ahead
most
currently
bulk
ceramics
measured
at
same
range.
Atomistic
observations
reveal
correlated
coexisting
local
rhombohedral‐tetragonal
nanoregions
embedded
cubic
matrix
constructed,
enables
polarization,
minimized
hysteresis,
significantly
delayed
polarization
saturation
concurrently,
endowing
along
.
These
findings
advance
superiority
feasibility
nanodomains
designing
highly
efficient
capacitors
field‐region
practical
applications.