Journal of Applied Physics,
Год журнала:
2025,
Номер
137(1)
Опубликована: Янв. 3, 2025
The
La1.9Ba0.1Cu1−yZnySnO6
(0
≤
y
0.25)
(LBCZSO)
ceramics
were
synthesized
by
the
solid-state
reaction,
and
effect
of
non-magnetic
Zn2+
ion
doping
on
crystal
structure
electrical
magnetic
properties
is
systematically
investigated.
It
found
that
all
samples
are
layered
double
perovskite
with
a
space
group
P21/m.
resistivity
ρ(T)
shows
semiconductor
behavior,
which
follows
Mott's
3D
variable-range
hopping
mode.
magnetizations
M(T)
isothermal
M-H
loops
reveal
coexistence
ferromagnetic
(FM)
antiferromagnetic
(AFM)
interactions
in
2D
CuO2
layer.
With
increasing
Zn
at
Cu
sites,
increases,
FM
transition
temperature
TC
decreases,
FM/AFM
weaken/enhance,
ground
state
system
changes
from
to
AFM
one.
suggested
cationic
electronegativity
plays
an
important
role
understanding
transport
Zn-doped
La1.9Ba0.1CuSnO6,
besides
radius.
Since
smaller
Cu2+
ions
compared
Sn4+
ions,
CuO6
octahedral
distortion
in-plane
compressive
strain
out-plane
tensile
induced
lattice
mismatch
between
SnO2
layers,
forming
C-type
AF
spin-canted
weak
plane.
different
electronegativities
leads
charge
transfer
resulting
electronic
redistribution
(transformation)
along
ordered
Cu–O–Zn
chains
Cu+
LBCZSO,
further
speeds
up
decrease
TC,
lead
abnormal
change
energy
W
Curie
Θ.
Besides,
it
confirmed
there
spin-glass
around
26
K
La1.9Ba0.1CuSnO6
compound.
Journal of Materials Chemistry A,
Год журнала:
2024,
Номер
12(46), С. 32396 - 32407
Опубликована: Янв. 1, 2024
The
structural,
magnetic,
and
magnetocaloric
properties
of
RE
2
CoTiO
6
oxides
were
determined
experimentally
theoretically.
Gd
was
found
to
be
attractive
for
low-temperature
magnetic
cooling.
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Июль 20, 2024
Abstract
Magnetic
refrigeration
based
on
the
principle
of
magnetocaloric
effect
(MCE)
in
magnetic
solids
has
been
considered
as
a
prospective
cooling
technology.
Exploring
suitable
materials
(MCMs)
is
vital
prerequisite
for
practical
applications.
Herein,
an
excellent
cryogenic
MCM—the
B
‐site‐ordered
Gd
2
CuTiO
6
double
perovskite
(DP)
oxide—which
exhibits
largest
MCE
among
known
Gd‐based
DP
oxides,
identified.
Such
enhanced
oxide
likely
stems
from
exchange
interaction
between
Gd‐4
f
and
Cu‐3
d
sublattices.
Under
field
change
0–7
T,
maximum
entropy
(−Δ
S
T
max
)
reaches
51.4
J
kg
−1
K
(378.2
mJ
cm
−3
),
which
much
larger
than
that
commercialized
refrigerant
3
Ga
5
O
12
,
38.3
(271.2
it
also
superior
to
most
recently
reported
benchmarked
MCMs,
indicating
possibility
This
work
provides
productive
route
future
MCM
design
by
harnessing
4
f–
interactions.
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 13, 2025
Abstract
The
dielectric
and
magnetic
coexistence
behavior
of
high
entropy
oxides
(HEOs)
injects
infinite
dynamism
in
promoting
electromagnetic
wave
(EMW)
absorption,
but
precisely
constructing
their
regular
geometries
at
the
nanoscale
remains
challenging.
Herein,
controlled
preparation
reduced
graphite
oxide
loaded
(CoFeNiCuMn)O
with
various
by
a
rapid
plasma
process
is
reported.
Modifying
only
metal
content
precursor
can
effectively
influence
morphology
properties
resulting
derivatives,
achieving
well‐matched
impedance
ensuring
outstanding
absorption
performance.
results
show
that
truncated
octahedral
HEO/RGO
composite
exhibits
strongest
absorbing
capacity,
minimum
reflection
loss
−57
dB
14.1
GHz
corresponding
effective
bandwidth
covering
4.13
GHz.
Moreover,
constitutive
relationship
between
multi‐element
synergies
microwave
characteristics
systematically
explored,
mechanism
proposed.
Delayed
wireless
charging
time
simulated
values
RCS
less
than
−10
dBm
2
whole
detection
angles
further
demonstrate
its
dissipation
capability
practical
application
scenarios.
This
study
not
enriches
variety
lightweight
efficient
materials
also
guides
for
new
configuration
design
HEOs.
