Abstract
CoFe2O4 sub-micron particles were synthesized through a hydrothermal method. The as-synthesized CoFe2O4 particles were then mixed with CaH2 and heated at 180 °C for reduction. In three parallel experiments, the reduction time was controlled to be 10, 20 and 30 h, respectively. The effects of reduction time on the particle morphology and magnetic properties were investigated. The results showed that the reduction time did not affect the morphology of CoFe2O4 under 180 °C, indicating that these particles had a good thermal stability at reduction temperature. The XRD patterns showed that long reduction time resulted in a stronger peak of CoFe2. The magnetic hysteresis loops of reduced products showed that magnetic exchange coupling was presented when the reduction time was 10 h. Further extended reduction time resulted in the kinks in the magnetic hysteresis loop, and magnetic decoupling.
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