Synthesis and Charaterization of Magnesium Zinc Ferrites as Electromagnetic Source

Fabrication of Mg1-XZnXFe2O4 (where x = 0.2, 0.3, 0.4 and 0.5) samples using a
conventional technique is reported. Oxides of magnesium, zinc and iron with purity of about 99.99%
were mixed with distilled water in a milling machine for 12 hours. They were then filtered and presintered
at 1250°C and sintered at 1350°C for 10 h in air. The phase and the crystal structure of the asprepared
samples were identified using X-Ray Diffraction analysis (XRD). Hysteresis graph was
evaluated using Vibrating Sample Magnetometer (VSM) to get the saturation magnetization (emu g-1)
and coercivity (G) value. Atomic Force Microscope (AFM) was used to observe the surface
morphology. The X-ray diffraction analysis showed major peak at plane (3 1 1) of the cubic structure
for all the ferrites. The largest value of density achieved was 4.69 gcm-3 which was exhibited by
sample with 0.5 mole fraction of zinc content. Highest saturation magnetization value (3.652emu g-1)
was obtained for the 0.3 mole fraction of zinc content. A strong correlation between the saturation
magnetization and zinc content was observed. We speculate that it is due to the Heisenberg superexchange
interaction of magnetic Fe3+ and non-magnetic Zn2+ occupying the tetrahedral sites. The
sample was used to induce electromagnetic (EM) waves in high operating frequency (5 MHz).