SYNTHESIS AND CHARACTEIZATION OF BaAl xFe12-xO19 BY SOL-GEL AUTO-COMBUSTION METHODS

• Main Author: Firdaus Hermansyah, M
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/33638
• Institution: Institut Teknologi Bandung

Since it first introduced by Philips as a permanent magnet material, the application of barium hexaferrite has covered various fields, especially as a material of magnetic storage and permanent magnet. This happened because of barium hexaferrite has high coercivity and magnetization. The manufacture of barium hexaferrite materials commonly involves solid state reaction at high temperatures. This can reduce coercivity due to particle growth. Therefore, various alternative methods are used to produce low-temperature barium hexaferrite material for good magnetic properties. Besides to lowering the temperature by changing the synthesis method, Al ion substitution can also change the magnetic properties of barium hexaferrite. In this study, the authors conducted a synthesis of barium hexaferrite material with a substitution of Al ions at low concentrations (0.5 < x < 2). The reaction process was carried out at pH 8 and the calcination temperature of 900oC. The synthesized powder was characterized by XRD, SEM, EDS, and VSM. From the XRD test results obtained BaAlxFe12-xO19phase in all samples, and ?-Fe2O3 in mostly all sample except at x = 1.6. The magnetic properties showed a decreasing in magnetization values both remanence and saturation in aluminum substitution barium hexaferrite materials. The sample saturation magnetization values ranged from 23.9emu/g to 56.7emu/g decreased from 65.8emu/g for barium hexaferrite material without substitution. The coercivity value decreased from 5.2 kOe to a minimum of 3.6 kOe in the sample with Al substitution where x = 1.6.