Heat treatment effects on spinel phase of ZnxNi1-xFe2O4 and MnFe2O4 nanoferrites

We report the effects of heat treatment on ZnxNi1-xFe2O4 (x = 0, 0.5 and 1.0) and MnFe2O4 ferrite nanoparticles. The as-prepared compounds were sintered from 400 degrees C to 1100 degrees C. Pure ZnFe2O4 (x = 1.0) and MnFe2O4 could be obtained under low reaction temperature of 200 degrees C. NiFe2O4 (x = 0) and Zn0.5Ni0.5Fe2O4 (x = 0.5) nanoferrites crystallized with single phase cubic spinel structure after annealing at 600 degrees C. The single phase cubic spinel structure of these compounds was destroyed after annealing at temperature above 700 degrees C. The magnetization measurements indicate superparamagnetic behavior of the nanosized compounds produced.