Abstract:
Manganese substituted nickel ferrite nanoparticles (MnxNi1-xFe2O4) have studied in this
research work. Hydrothermal Method is used to synthesize all the samples at 200℃ for 12
hours. The effect of manganese substitution on particle size, structure, electric and magnetic
properties has been investigated by X-Ray Diffraction (XRD) and Vibrating Sample
Magnetometer (VSM). X-Ray diffraction shows that all the sample (x=0, 0.6, 1) peaks have
cubic crystalline structure. Crystallite size calculated by Debye Scherer’s formula. Average
crystallite size is found by 25.96nm-47.3nm. The peak position (2θ) of the samples shifted to
lower angles by substitution of manganese in nickel ferrite. Substitution of manganese in the
nickel ferrite increases the lattice constant and decreases the crystallite size. Increase in lattice
constant is due to the larger ionic radii of manganese replaced by smaller ionic radii of nickel.
Growth rate is very fast at (x=0), further increase in substitution of manganese in the nickel
ferrite decreases the growth rate at (x=1). Magnetic properties are measured by VSM at room
temperature. Hysteresis loop is used to measure the magnetic parameter such as saturated
magnetization, coercivity and remnant magnetization. The atomic magnetic moment of
manganese is greater than nickel ferrite. Substitution of manganese in the nickel ferrite
increases the saturated magnetization whereas, coercivity decrease. Saturated Magnetization
in the range of 55.4- 77.9emu/g. However, the composition with manganese content x=0.6
and nickel 1-x 0.4, coercivity of 106Oe shows nearly super paramagnetic behavior. Remnant
magnetization also increase by substituting the manganese in the nickel ferrite.
