Effect of pH and annealing temperatures on structural, magnetic, electrical, dielectric and adsorption properties of manganese ferrite nano particles

Abstract

Manganese ferrite (MnFe2O4) samples of good homogeneity were synthesized at pH 8 and pH 11 for different annealing temperatures through wet chemical synthesis by a co-precipitation method. Particle size increases and crystalline nature improved with increase in annealing temperatures as indicated in XRD peaks. EDS study confirmed the purity of the prepared samples. The cubic spinel structure and bond stretching of samples were analyzed through FTIR. The surface studies were carried out using SEM micrographs. The SAED patterns predicted crystalline nature and the particle size was found to be 20–40nm as confirmed through TEM analysis. The magnetic hysteresis curves were analyzed using VSM and super paramagnetic nature of soft magnetic material was reported for samples prepared at pH 8. The dielectric and conductivity studies confirm that the material can be used in high frequency applications. The application of the synthesized ferrite as adsorbent of toxic heavy metal Cr(VI) has been successfully tested. The adsorption and removal depend on quantity of adsorbent, annealing temperatures of sample, pH of sample and initial concentration of Cr(VI).