Open AccessEffect of cobalt substitution on structural, electrical and magnetic properties of NiFe2O4
Author(s) -
Babu Vijaya Kannipamula,
Ravi Chandra Matangi,
Kumar Santosh Gondu,
Kantamsetti Jagadeesh
Publication year - 2017
Publication title -
processing and application of ceramics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.326
H-Index - 15
eISSN - 2406-1034
pISSN - 1820-6131
DOI - 10.2298/pac1701060v
Subject(s) - materials science , spinel , nanocrystalline material , ferrite (magnet) , cobalt , nickel , dielectric , citric acid , octahedron , analytical chemistry (journal) , metallurgy , crystallography , crystal structure , composite material , nanotechnology , chemistry , optoelectronics , organic chemistry , chromatography
Nickel ferrite and cobalt substituted nickel ferrite were synthesized by sol-gel method using citric acid as chelating reagent. X-ray diffraction revealed the formation of nanocrystalline particles having spinel structure with space group Fd3m. FTIR spectra showed fundamental absorption bands in the range 400–1300 cm-1, related to iron ions on both octahedral and tetrahedral sites which are typical for ferrite structure. SEM analyses confirmed that the particles are agglomerated with an average size of about 1.5 µm. The ferrite powders were pressed at 5 MPa and sintered at 1200 °C for 5 h. Conductivities, impedance analyses and dielectric properties of NiFe2O4 and Ni0.7Co0.3Fe2O4 ceramics were investigated over the frequency range of 20 Hz to 1 MHz at room temperature. The obtained experimental results are in good agreement with the reported values