Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
Journal of materials science. Materials in electronics, 2022-05, Vol.33 (15), p.12182-12200
Ort / Verlag
New York: Springer US
Erscheinungsjahr
2022
Quelle
springer (창간호~2014)
Beschreibungen/Notizen
Cobalt-substituted zinc spinel ferrites having chemical composition Zn
1−
x
Co
x
Fe
2
O
4
with stoichiometric proportion ‘
x
’ equals 0.00, 0.25, 0.50, 0.75, and 1.00 have been synthesized by sol–gel citrate route sintered at 1000 °C for 6 h. All the fabricated specimens have been characterized by using X-ray diffraction, scanning electron microscopy, energy-dispersive spectroscopy, Raman spectroscopy, and vector network analyzer. The XRD patterns ensured the existence of a cubic spinel crystal structure having single phase of space group
Fd
-3
m
. Decline in crystallite size (
D
c
) from 48.016 to 45.314 nm with an increase in cobalt content displayed the nanocrystalline nature of the synthesized specimens. The values of lattice constant (
a
avg
,
a
px
,
a
true
,
and
a
th
) obtained from four different approaches are perfectly coordinating with each other. The complex electromagnetic parameters (
ε
r
and
μ
r
) measured by VNA are found to be increasing with Co
2+
doping in K-band (18–26.5 GHz) frequency range. The reflection loss study revealed that all the synthesized compositions have yielded more than 90% absorption intensity in the studied frequency band due to higher magnetic and dielectric losses of the synthesized ferrites thereby making them a potential candidate for the implementation of microwave absorbers at higher frequencies.