Thermo Mechano-Chemical Synthesis, Physical Characterization and Magnetic Properties of Co-Mg-Ferrite Nanoparticles

 Substitution of Mg2 + in ferrite nanoparticles improves properties such as chemical stability, corrosion resistance, magnetic anisotropy, and optical-magnetic properties. In this study Co-Mg-Ferrite single phase is synthesized using mechanical alloying as a simple and inexpensive method. XRD and SEM were used for characterizing the samples. Shape of powder particles after milling was irregular and their size was was in the range of 5-48 nm. XRD results revealed that after 30 hours of milling and sintering at temperatures above 700oC, single phase Co-Mg-ferrite is produced. Grain size of the sintered products is 33 to 85 nm and the lattice strain is 0.88 to 0.75%. Increasing the sintering temperature from 700C to 1100C resulted in improved magnetic properties. Magnetic permeability increased with increasing sintering temperature due to structural changes. Paramagnetic properties in samples sintered below 1000C are dominant while sintering at 1100C produced a strong ferromagnetic state giving a well-formed sigmoid-shape hysteresis loop.