Optical and magnetic properties of Co2+ substituted NiFe2O4 nanoparticles

Ni1-xCoxFe2O4 nanoparticles with x = 0.0, 0.5 and 1.0 were synthesized by wet chemical co-precipitation method. Structural analysis reveals the formation of single phase cubic spinel structure of space group Fd3m with a narrow crystallite size distribution between 15 to 24 nm. UV-vis diffuse spectra...

Full description

Saved in:
Bibliographic Details
Main Authors: Joshi, Seema, Kumar, Manoj, Srivastava, Geetika
Format: Conference Proceeding
Language:English
Subjects:
Anisotropy
Band gap
Chemical precipitation
Chemical synthesis
Cobalt
Coercivity
Crystallites
Dipole interactions
Dipoles
Energy gap
Magnetic moments
Magnetic properties
Magnetic saturation
Magnetism
Nanoparticles
Nickel ferrites
Optical properties
Organic chemistry
Size distribution
Structural analysis
Substitutes
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Ni1-xCoxFe2O4 nanoparticles with x = 0.0, 0.5 and 1.0 were synthesized by wet chemical co-precipitation method. Structural analysis reveals the formation of single phase cubic spinel structure of space group Fd3m with a narrow crystallite size distribution between 15 to 24 nm. UV-vis diffuse spectra indicate that Ni1-xCoxFe2O4 samples were indirect band gap materials. The larger size of Co2+ ion results in weaker electrostatic interaction and hence band gap decreases with increasing Co2+ concentration. Magnetic properties are strongly influenced and improved with increasing Co2+ concentrations. The higher magneto-crystalline anisotropy of Co2+ in comparison of Ni2+ is responsible for increased coercivity of doped samples. The increase in saturation magnetization with Co2+ content is attributed to the high magnetic moment of Co2+ (3µB) than that of Ni2+ (2µB). The ESR study reveals that the dipole-dipole interaction is dominant in Co2+ substituted samples while superexchange interactions are dominant in pure nickel ferrite samples.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.4948126