  We have investigated the Vanadium- (V) substituted Ni-Zn-Co ferrites where
the samples were prepared using solid-state reaction technique. The impact of
V5+ substitution on the structural, magnetic, dielectric and electrical
properties of Ni-Zn-Co ferrites has been studied. XRD analysis confirmed the
formation of a single-phase cubic spinel structure. The lattice constants have
been calculated both theoretically and experimentally along with other
structural parameters such as bulk density, X-ray density and porosity. The
FESEM images are taken to study the surface morphology. FTIR measurement is
also performed which confirms spinel structure formation. The saturation
magnetization (Ms), coercive field (Hc) and Bohr magneton (B) were calculated
from the obtained M-H loops. The temperature dependent permeability is studied
to obtain the Curie temperature. Frequency and composition dependence of
permeability was also analyzed. Dielectric behavior and ac resistivity are also
subjected to investigate the frequency dependency. An inverse relationship was
observed between the composition dependence of dielectric constant and ac
resistivity. The obtained results such as the electrical resistivity,
dielectric constants and magnetic properties suggest the appropriateness of the
studied ferrites in microwave device applications.
