FABRIKASI NANOPARTIKEL ZINC FERRITE (ZnFe2O4) DENGAN METODE KOPRESIPITASI DAN KARAKTERISASI STRUKTUR KRISTAL DAN SIFAT KEMAGNETANNYA; FABRICATION AND CHARACTERIZATION OF STRUCTURAL AND MAGNETIC PROPERTIES ZINC FERRITE (ZnFe2O4) NANOPARTICLES BY COPRECIPITATION METHOD

Asmin, La Ode, Edi Suharyadi

2015 | Disertasi | FMIPA

Zinc ferrite (ZnFe2O4) nanoparticles have been synthesized by co-precipitation method. The ZnFe2O4 was synthesized using the powder of zinc sulphate hepta hydrate (ZnSO4.7H2O) and ferric chloride hexa hydrate (FeCl3.6H2O). Sodium hydroxide (NaOH) has been used as a co precipitant. Synthesis parameters that have been investigated were concentration of NaOH (1.5, 3, and 6 M), synthesis temperature (room temperature, 60, and 90oC) and stirring duration (60, 90, and 120 minutes). The structural, particle size, magnetic properties, and functional groups of ZnFe2O4 nanopartilces were characterized by using X-Ray Diffractometer (XRD), Transmission Electron Microscopy (TEM), Vibrating Sample Magnetometer (VSM), and infrared spectrometer (FTIR). The XRD results showed that the co-precipitated nanoparticles were zinc ferrite phase with mixture of normal and inverse spinel structures. The particle size was observed decrease from 8.38 – 5.61 nm as increase concentration of NaOH, increase from 8.09 – 9.22 nm as increase of synthesis temperature, and decrease from 8.38 – 7.12 nm as increase of stirring duration. The results of VSM showed that magnetization reach maximum on 15 kOe and remanent magnetization tends to increase with increase of lattice parameter ratio. The coercive field was tend to increase with decrease of particle size. Ferromagnetic property was obtained for particle of size 5.61 nm. Paramagnetic property was obtained for particle of sizes in the range 7.12 – 9.22 nm. The results of FTIR confirmed that the formation of ZnFe2O4 phases. The FTIR spectra showed the characteristic features of vibrational bands corresponding to spinel ferrite.

Kata Kunci : nanoparticles; zinc ferrite (ZnFe2O4); magnetic properties; co precipitation