Abstract
In this work, the possibility of using the mechanochemical route to synthesize Mn0.5Zn0.5Fe2O4 single phase in the ZnO/MnO/Fe2O3 (system 1) and Zn/MnO2/Fe2O3 (system 2) was investigated. The effects of milling time, heat treatment, and reaction mechanism were also studied. The XRD results indicated that the Mn0.5Zn0.5Fe2O4 ferrite was formed after 20h and 5h milling, respectively in the systems 1 and 2, with some residual Fe2O3. By performing a Self-propagating high-temperature synthesis for both the systems, it was determined that a mechanism of the ferrite formation could occur by solid-state diffusion mode (gradual mode) for system 1 and by self-propagating mode (explosive/combustion mode) for system 2. By increasing the milling time, the average crystallite size decreased and lattice strain increased for both the systems. Interestingly, the crystallite sizes were smaller in the system 2. TEM micrographs indicated the average particle sizes of 46nm and 33nm, respectively for system 1 and 2, after 40h milling which grew to 70 and 52nm after annealing at 600°C for 2h. VSM results suggested a saturation magnetization value of 40h-milled samples to be 4 and 7emu/g, respectively for systems 1 and 2, which increased to 22, 37emu/g after annealing.
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