Iron
manganese
trioxide
(FexMn1-x)2O3
nanocrystals
were
synthesized
by
the
sol-gel
method.
The
80
K
Mössbauer
spectrum
was
well-fitted
using
two
doublets
representing
8b
and
24d
crystallographic
sites
of
phase
weak
extra
sextets
which
attributed
to
crystalline
amorphous
hematite.
area
ratio
between
percentage
areas
used
as
constraints
in
Rietveld
analysis
x-ray
diffraction
(XRD)
data.
Our
findings
showed
formation
a
bixbyite
primary
with
stoichiometry
(Fe0.248Mn0.717)2O3,
mean
size
~48
±
1
nm
plus
secondary
hematite
~8
nm.
Raman
exhibits
six
active
modes,
typical
(Fe,Mn)2O3,
modes
associated
phase.
photoelectron
spectroscopy
(XPS)
confirmed
presence
oxygen
vacancy
onto
particle
surface,
varying
oxidation
states
(Fe3+,
Fe2+,
Mn3+,
Mn4+).
strong
predominance
Fe2+
over
Fe3+
vacancies
at
leading
reduction
order
keep
charge
balance.
X-band
magnetic
resonance
(MR)
data
revealed
single
broad
line
whole
temperature
range
(3.8
≤
T
300
K),
g-value
decreasing
monotonically
from
3.93
0.01
50
down
2.18
K.
dependence
both
field
linewidth
shows
remarkable
change
40-50
K,
herein
credited
surface
spin
glass
behavior.
model
picture
explain
MR
lower
(below
about
K)
assumes
nanoparticles
core-shell
structure.
Results
indicate
that
below
shell’s
system
reveals
paramagnetic
glass-like
transition
upon
cooling,
critical
estimated
43
In
higher
range,
superparamagnetic
(secondary)
contributes
remarkably
linewidth.
Zero-field-cooled
(ZFC)
field-cooled
(FC)
show
irreversibility
peak
ZFC
curve
~33
paramagnetic-ferrimagnetic
main
Hysteresis
5
low
coercive
4
kOe,
magnetization
not
reaching
saturation
70
suggesting
ocurrence
ferrimagnetic
core
disorder
characteristic
spin-glass-like
Next Materials,
Journal Year:
2023,
Volume and Issue:
1(3), P. 100025 - 100025
Published: June 25, 2023
With
its
unique
advantages
in
artificial
intelligence,
data
analysis,
interpolation
and
numerical
extrapolation,
etc.
ML
has
recently
been
quickly
developed
for
the
discovery
of
advanced
energy
materials.
In
particular,
many
algorithms
have
to
predict
material
properties.
Herein,
we
first
introduce
used
science
structure
each
algorithm.
Then
examine
that
functional
materials,
especially
solar
cells,
batteries,
phase-change
Finally,
disadvantages
algorithm
are
compared
aid
readers
choosing
a
suitable
specific
applications.
Batteries,
Journal Year:
2023,
Volume and Issue:
9(2), P. 112 - 112
Published: Feb. 5, 2023
This
work
aimed
to
predict
the
crystal
structure
of
a
compound
starting
only
from
knowledge
its
chemical
composition.
The
method
was
developed
select
new
materials
in
field
lithium-ion
batteries
and
tested
on
Li-Fe-O
compounds.
For
each
testing
compound,
correspondence
with
respect
training
compounds
evaluated
simply
by
calculating
Euclidean
distance
existing
between
stoichiometric
coefficients
elements
constituting
two
At
under
test
assigned
for
which
value
minimum.
results
showed
that
model
can
crystalline
group
an
accuracy
higher
than
80%
precision
90%,
cut-off
four.
then
used
manganese-based
(Li-Mn-O).
analysis
conducted
twenty
randomly
selected
70%.
Out
ten
valid
predictions,
nine
were
true
positives,
90%.
Scientific Reports,
Journal Year:
2024,
Volume and Issue:
14(1)
Published: Oct. 29, 2024
Concrete
has
been
widely
utilized
as
a
radiation
shielding
material
due
to
its
properties
and
structural
integrity.
This
study
aims
evaluate
the
efficiency
of
ordinary
concrete
versus
barite
materials,
focusing
on
physical
aspects
changes
in
crystal
size
lattice
parameters
after
neutron
irradiation.
Specifically,
research
investigates
effectiveness
these
materials
across
different
grades
(M15,
M25,
M35,
M45)
against
gamma-ray
sources
Cobalt-60
Caesium-137.
The
methodology
involves
measuring
linear
attenuation
coefficient
(μ),
half
value
layer
(HVL),
tenth
(TVL),
mean
free
path
(MFP).
Additionally,
X-ray
diffraction
(XRD)
was
employed
assess
crystallite
parameter
post-irradiation
for
Results
indicate
that
incorporating
an
aggregate
significantly
enhances
density
macroscopic
concrete.
Irradiation
with
Cesium
137
revealed
lower
(μ)
ranging
from
0.172
0.195
cm
