Magnetic phase transition in Co0.5Zn0.5Fe2O4 nanoparticles
Muhammad Misbah Muhammad Zulkimi, Ismayadi Ismail
The objective of this work is to expose and explain experimental microstructure property relationship with magnetic properties as they evolved with increasing sintering temperature. Mechanical alloying (MA) was used to prepare Co0.5Zn0.5Fe2O4 nanoparticles with sintering temperature from 600oC to 1350oC with an increment of 50oC. The phase changes, grain size and magnetic properties were measured. Magnetic parameter, namely, hysteresis loop was measured at room temperature for samples sintered from 600oC to 1350oC. The results showed that Cobalt zinc ferrite cannot be formed directly through milling alone, but heat treatment was necessary. After annealing the sample at 600oC, cobalt zinc ferrite phase was first obtained with an average grain size in the nanometric range (0.089µm). B-H hysteresis loops could be categorized into three distinct groups according to their shapes. The activation energy value increased with increasing grain size caused by the increasing temperature, and found to be 7.58 kJ/mol, 47.11 kJ/mol and 189.54 kJ/mol. The slopes of the activation energy corresponded to the three different groups for magnetic properties (B-H loops). Meanwhile, the resistivity could be classified into two parts based on their shape of the graph, and their values decreased with increasing temperature which confirmed that the sintered samples under investigation possessed an semiconducting behavior.
Mechanical Alloying, Magnetic Parameters, Resistivity
Published online 1/1/2017, 23 pages
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