Abstract
This study aims to identify the effect of preparation temperature on microstructure and magnetic properties of magnetite nanoparticles prepared from FeSO 4 .7H 2 O and FeCl 3 .6H 2 O by using co-presipitation method without organic solvent and surfactant. Precursors were prepared at 30 o C, 60 o C, and 90 o C under atmospheric pressure. Microstructure and diameter distribution of magnetite nanoparticles were analyzed by using XRD, FTIR, TEM, and imageJ software, while the magnetic properties were analized using VSM. The identification result show that the magnetite phase was formed on all samples with polycrystalline structure. The increasing of preparation temperature was followed by increase in diameter of grains and oxidation rate of magnetite phase into maghemit ( -Fe 2 O 3 ). The superparamagnetic properties almost can be observed especially in sample prepared at 30 o C, where magnitude of remanent and coersivity is 3.39 emu/g and 23.93 Oe, respectively. The magnitude of remanent and coersivity increases as preparation temperature increases and superparamagnetic effect decrease. KEYWORD :
Highlights
ABSTRACT−This study aims to identify the effect of preparation temperature on microstructure and magnetic properties of magnetite nanoparticles prepared from FeSO4.7H2O and FeCl3.6H2O by using the coprecipitation method without organic solvent and surfactant
Microstructure and diameter distribution of magnetite nanoparticles were analyzed by using XRD, FTIR, transmission electron microscopy (TEM), and ImageJ software, while the magnetic properties were analyzed using vibrating sample magnetometer (VSM)
The identification result shows that the magnetite phase was formed on all samples with a polycrystalline structure
Summary
Volume 16, Nomor 1, Februari 2019 ISSN : 1829-796X (print); 2514-1713(online) https://ppjp.ulm.ac.id/journal/index.php/f/. Magnetit dalam bentuk makroskopik (bulk) memiliki sifat ferrimagnetik dengan temperatur Currie yang tinggi (T = 850 K) (Daoush, 2017). Sifat ferrimagnetik pada bahan tersebut dapat mengalami perubahan yang signifikan bila diameter butir partikel magnetit berubah dramatis hingga mencapai orde nanometer (
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