Abstract
Cobalt ferrite nanopowders were prepared with low annealing temperatures (400 °C and 600 °C) using four different synthesis methods: co-precipitation, sol-gel, sol-gel autocombustion and microemulsion. The pure phase is obtained in all the samples and confirmed using the XRD diffraction. The crystallite size is calculated based on the XRD patterns and ranged between ~9 nm and ~26 nm. The SEM micrographs show an agglomeration with an increase of grain size between 400 °C and 600 °C samples for all the used methods. The magnetic properties are given. The best obtained values are MS = 80,319 emu/g, HC = 2057,97 Oe and (BH)max = 0.3313 MGOe for co-precipitation, sol-gel and sol-gel autocombustion, respectively. An improvement of 89% in (BH)max value is observed in the case of sol-gel auto-combustion when we go from 400 °C to 600 °C.
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