Abstract

Magnetic cobalt ferrite (CoFe2O4) nanocrystals were synthesized via the hydrothermal method and the crystallite size was measured using Sherrer's equation. Instrumental broadening was a significant parameter for determining crystallite size. The effect of annealing time and calcination on crystallite size and magnetic properties was discussed. It was found that the coercivity was highly dependent on the crystallite size. As the crystallite size increased from 61 to 68.2nm, room temperature coercivity increased from 1488Oe to 1700Oe, while high coercivity (5.2kOe) was achieved at lower temperature (80K). It was found that the presence of hematite could affect the crystallite size after calcination.

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