PENGARUH LARUTAN PENGENDAP TERHADAP PEMBENTUKAN HEKSAFERIT BaO.6 Fe2O3
DOI:
https://doi.org/10.17146/jsmi.2012.13.3.4667Keywords:
Heksaferit, Kimia Basah, Ko-presipitasi, Koersivitas, Remanensi, Hexaferrite, Wet Chemical, Co-precipitation, Coercivity, RemanenceAbstract
PENGARUH LARUTAN PENGENDAP TERHADAP PEMBENTUKAN HEKSAFERIT BaO.6 Fe2O3. Nano-partikel BaO.6 Fe2O3 heksaferit telah berhasil disinteis dengan metoda kimia basah menggunakan larutan pengendap natrium hidroksida (NaOH) dan tetramethyl ammonium hidroxida (TMOH). Metoda kimia basah yang digunakan dalam penelitian ini adalah metoda ko-presipitasi. Identifikasi fasa sampel dilakukan menggunakan teknik difraksi sinar-X dan mikrostruktur sampel diamati dengan Transmission Electron Microscope (TEM) sedangkan perubahan sifat kemagnetan bahan diukur menggunakan Vibrating Sample Magnetometer (VSM). Hasil pengamatan menunjukkan bahwa koersivitas intrinsik (Hci) dan remanensi magnet (σr) BaO.6 Fe2O3 hasil sintesis menggunaka larutan TMOH diperoleh sekitar 5,1 kOe dan 31,3 emu/gr, lebih tinggi bila dibandingkan dengan koersivitas dan magnet remanen BaO.6 Fe2O3 hasil sintesis dengan larutan NaOH dengan Hci ≈ 4,56 kOe dan σr ≈ 27,2 emu/gr. Nilai koersivitas yang tinggi disebabkan oleh karena ukuran partikel BaO.6 Fe2O3 hasil sintesis menggunakan larutan TMOH sangat halus. Semakin tinggi suhu sintering, koersivitas magnet cenderung turun yang disebabkan oleh pertumbuhan partikel.
ABSTRACT
THE EFFECT OF PRECIPITATING REAGENT TO THE FORMATION OF BaO.6 Fe2O3 HEXAFERRITE. BaO.6 Fe2O3 hexaferrite nano-particle had been successful prepared by Wet chemical method using natrium hydroxide (NaOH) and tetramethyl-ammonium hydroxide (TMOH) precipitating reagent. Wet chemical method used in this research is co-precipitation method. Pahse identification of the sample was done using x-rays diffraction technique, and the microstructure of the sample was observed with Transmission Electron Microscope (TEM), where as the magnetic properties change of the sample was measured using Vibrating Sample Magnetometer (VSM). Magnetic coercivity (Hci) and remanence (σr) of BaO.6 Fe2O3 resulted by precipitation using TMOH was obtained about 5.1 kOe and 31.3 emu/gr is higher if compared with those of BaO.6 Fe2O3 precipitated with NaOH solution with Hci ≈ 4,56 kOe and dan σr ≈ 27,2 emu/gr. High coercivity value caused by the size of the BaO.6 Fe2O3 particles synthesized using a TMOH solution was very fine. Higher sintering temperature, magnetic coercivity tends to fall due to the particle growth.
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