Modifications in the structural and magnetic properties of co-precipitated cobalt ferrite nanoparticles can be accomplished by varying the annealing time periods during the synthetic process. Experimental results show that high-purity cobalt ferrite nanoparticles are obtained using a co-precipitation process. The dependence of the crystallite sizes on the annealing time was successfully demonstrated using XRD and SEM. Finally, vibrating sample magnetometer analyses show that the magnetic properties of the cobalt ferrite nanoparticles depend on their relative particle sizes.
Studi pendahuluan sintesis nano partikel ferromagnetik cobalt ferrit dengan metode ko-presipitasi dilanjutkan dengan aniling telah dilakukan. Aniling dilakukan pada keadaan atmosfir. Hasil karakterisasi TG-DTA memperlihatkan bahwa proses pertumbuhan kristal berada pada temperatur lebih dari 500 • C. Hasil analisis struktur kristal memperlihatkan sampel yang terbentuk adalah CoFe2O4 dengan puncak spektrum berada pada sudut 2θ = 35,7 • bersesuaian dengan bidang indeks Miller (hkl) = 311 dengan ukuran butiran sekitar 28,5 nm. Akhirnya, hasil analisis vibrating sampel magnetometer menegaskan bahwa sampel cobalt-ferit memiliki medan coersif HC = 313 Oe.
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