ECS Journal of Solid State Science and Technology,
Journal Year:
2024,
Volume and Issue:
13(6), P. 064003 - 064003
Published: June 3, 2024
Nanoscale
particles
of
neodymium-substituted
cobalt-cadmium
generic
formula
for
nanoferrite
Co
0.4
Cd
0.6
Nd
x
Fe
2−x
O
4
samples
at
X
=
0.000,
0.003,
0.005,
0.007,
0.009,
and
0.011
were
studied.
The
prepared
powders
synthesised
low
temperatures
using
citrate
gel
auto-combustion
process.
calcined
500
°C
four
hours.
morphological
properties
the
sintered
investigated,
their
crystal
structure
was
determined
by
X-ray
diffraction
(XRD)
scanning
electron
microscopy
(SEM).
XRD
peaks
confirmed
spinel
ferrite
structure.
lattice
parameter
calculated
from
showed
decreasing
trends
with
8.442
to
8.308.
SEM
revealed
an
irregularly-shaped
grain
morphology
a
homogeneous
distribution.
Raman
spectroscopy
analysis
slight
frequency
changes
in
modes
doped
samples,
attributed
variations
cation
are
located
191,
291,
461,
591,
671
cm
−1
.
UV
studies
that
energy
band
gap
values
decrease
increasing
3+
concentration.
Direct
optical
obtained
1.238,
1.248,
1.199,
1.135,
1.134,
1.101
eV
doping.
magnetic
hysteresis
SQUID-VSM
magnetometer.
curves
nanoparticles
show
increase
coercivity
doping
This
enhancement
is
multi-domain
behaviour.
ECS Journal of Solid State Science and Technology,
Journal Year:
2024,
Volume and Issue:
13(3), P. 037008 - 037008
Published: March 11, 2024
In
the
current
study,
magnetic
nanoparticles
of
neodymium
and
samarium
substituted
Mg-Zn-Cu,
with
a
chemical
composition
Mg
0.5
Zn
Cu
0.05
R
x
Fe
1.95-x
O
4
(x
=
0.05;
Nd,
Sm)
were
produced
via
sol-gel
auto-combustion
route.
XRD
indicates
evolution
cubic
symmetry
having
Fd3m
space
group
no
impurities
at
room
temperature.
The
FESEM
images
show
irregularly
shaped
agglomerated
grains
in
all
samples.
FTIR
examination
reveals
stretching
vibrations
among
metal
cations
anions
interstitial
vacancies.
M-H
graphs
demonstrates
that
prepared
nanoferrites
have
low
rentivity
(0.18–0.84
emu
g
−1
)
coercivity
(11.25–34.03
Oe)
indicating
formation
superparamagnetic
nature.
From
electromagnetic
traits,
observed
sample’s
real
permeability
(
μ
″)
permittivity
ε
′)
along
dielectric
loss
reduced
increasing
applied
field
frequency,
typical
behaviour
spinel
nanoferrites.
This
may
be
explained
by
Maxwell-Wagner
interfacial
polarisation
electron
hopping
ferrous
ferric
ions.
variations
coercivity,
anisotropy
constant,
traits
provide
strong
evidence
samples
are
thermally
stable
potential
to
used
solenoids
transformers,
also,
more
resistive
devices
operate
high
frequency.
Journal of Advanced Ceramics,
Journal Year:
2024,
Volume and Issue:
13(3), P. 293 - 309
Published: Jan. 16, 2024
In
near-field
communication
(NFC)
antennas,
soft
magnetic
ferrites
are
usually
applied
as
substrate
to
reduce
eddy
current
loss
and
increase
field
coupling.
For
this
purpose,
the
required
have
high
permeability
saturation
magnetization
together
with
low
dielectric
loss.
However,
for
most
ferrites,
it
is
difficult
meet
all
of
requirements.
Herein
novel
Ni-Zn
ferrite
ceramics
co-doped
by
Ho3+
Co2+
ions
chemical
formula
Ni0.5-xZn0.5Ho0.02CoxFe1.98O4
(x=0-0.2)
were
designed
prepared
balance
these
needs
on
basis
molten
salt
synthesis
metal
nitrates
raw
materials
KOH
precipitation
agent
precursor.
After
substitution
Ho3+,
initial
decrease,
but
further
doping
Co2+,
gradually
increases,
while
continues
decrease.
When
x=0.1,
sample
will
lowest
constant,
loss,
well
highest
Curie
temperature
(305
ºC).
Moreover,
acquired
been
simulatively
in
NFC
revealing
that
device
manufactured
optimal
Ni0.4Zn0.5Ho0.02Co0.1Fe1.98O4
would
significantly
improved
performance
at
13.56
MHz
leakage
long
transmit
distance
field.
Therefore,
be
a
good
candidate
antenna
substrates.
