The Effect of Milling Time on Ni0.5Zn0.5Fe2O4 Compositional Evolution and Particle Size Distribution

Abstract

Problem statement:This study involved an investigation to ascertain the diffusion of NiO and ZnO into the tetrahedral and octahedral sites using mechanical alloying method. The effect of mechanical alloying towards particle size was also reported. Approach: NiO, ZnO and Fe 2 O 3 precursors were mechanically alloyed to synthesis ultrafine powders of Ni 0.5 Zn 0.5 Fe 2 O 4 . Various milling times were employed to study the effect of milling time on the materials. The ultrafine powder was sampled after each milling time and further characterized using XRD to investigate the phases of the powder and the crystallite size, SEM for the morphology and TEM for particle size investigation. Results: The XRD spectra indicated the precursors reacted during milling with the diffusion of ZnO and followed by NiO into their respective crystallographic sites. SEM micrographs showed the agglomeration of powders due to high energy milling and TEM images proved the particles of the materials were of nanosize. Conclusion: It was concluded that samples prepared using mechanical alloying technique appear to be a potential method for large production due to the possible reduction of cost and also reduction of particle size against milling time.

Effect of Cu Substituted in Ni-Zn Ferrite by Chemical Co-Precipitation Method

“…The crystal size varied from 42 to 19 nm as x (=Cu) varied from 0.1 to 0.7 in Ni 0.2 Cu x Zn 0.8-x Fe 2 O 4ferries series, respectively. In this investigation, the results are in accordance with the literature studies15,16 .…”

Morphology and dielectric properties of single sample Ni0.5Zn0.5Fe2O4 nanoparticles prepared via mechanical alloying

“…Mechanical alloying process reaches a steady state when the particles have homogenous shape and size. A steady state is achieved after 30 h milling when there is no change in crystallite size and the size remains constant [6]. There is also a relationship between the temperature of the outer wall and the milling time, and the temperature of the vial increases slowly as the milling time is extended.…”

Effect of Milling Time on Co<SUB>0.5</SUB>Zn<SUB>0.5</SUB>Fe<SUB>2</SUB>O<SUB>4</SUB> Microstructure and Particles Size Evolution via the Mechanical Alloying Method

“…It is also possible that longer hour of milling may not affect the crystal size of the materials under test. [9] stated that constant crystallite size from the longer milling time is a reflection of the lattice strain which no longer increases and remains almost constant till the end of milling. This shows that high-energy impact produces enormous amount of lattice imperfections to the sample.…”