SIFAT MAGNET BARIUM HEKSAFERIT BaO.6Fe2O3 HASIL SINTESIS DENGAN METODA KIMIA BASAH[Barium Hexaferrite BaO.6Fe2O3 Magnetic Properties Synthesized with a Wet Chemicals Method]

Abstract

SIFAT MAGNET BARIUM HEKSAFERIT BaO.6Fe2O3 HASIL SINTESIS DENGAN METODA
KIMIA BASAH. Barium heksaferit, BaO.6Fe2O3 telah berhasil disintesis dengan metoda kimia basah, yaitu
metoda ko-presipitasi dan mikro-emulsi. Prekursor sampel kemudian disinter pada 900 °C dan 1000 °C selama
3 jam. Pengamatan struktur bahan dilakukan dengan beberapa peralatan, seperti teknik difraktometer sinar-x
(XRD), transmission electron microscope (TEM), vibrating sample magnetometer (VSM), differential thermal
dan thermogravimetric analysis (DTA dan TGA). Hasil pengamatan menunjukkan bahwa koersivitas intrinsik
BaO.6Fe2O3 hasil sintesis dengan metoda ko-presipitasi diperoleh sekitar 5,36 kOe, lebih besar bila
dibandingkan dengan koersivitas BaO.6Fe2O3 hasil sintesis dengan metoda mikro-emulsi yang hanya 3,89 kOe.
Koersivitas magnet yang tinggi ini erat terkait dengan ukuran partikel BaO.6Fe2O3 yang sangat halus dengan
kandungan fasa impuritas rendah. Hasil ini didukung oleh pengamatan dengan TEM yang memperlihatkan
bahwa ukuran partikel BaO.6Fe2O3 hasil ko-presipitasi diperoleh antara 50 - 200 nm.

Abstract

Barium heksaferit, BaO.6Fe2O3 has been successfully synthesized by a wet chemical method, namely coprecipitation
and micro-emulsion method. Precursor samples were then sintered at 900 °C and 1000 °C for
3 hours in air environment. Observations were conducted with some equipment, such as x-ray diffraction
techniques (XRD), transmission electron microscope (TEM), vibrating sample magnetometer (VSM),
thermogravimetric and differential thermal analysis (DTA and TGA). The results showed that the intrinsic
coercivity of BaO.6Fe2O3 synthesized with co-precipitation method was obtained of about 5.36 kOe, larger
than the coercivity of BaO.6Fe2O3 synthesized with micro-emulsion method which is only 3.89 kOe. High
magnetic coercivity is closely related to particle size of BaO.6Fe2O3 was very smooth with a low content of
impurity phase. This result was supported by TEM observation showing that the particle size of BaO.6Fe2O3
obtained by co-precipitaion gained between 50-200 nm.