PENGARUH HIGH-ENERGY MILLING TERHADAP SIFAT MAGNETIK BAHAN BARIUM HEKSAFERIT (BaO.6Fe2O3)

Abstract

PENGARUH HIGH-ENERGY MILLING TERHADAP SIFAT MAGNETIK BAHAN BARIUM HEKSAFERIT (BaO.6Fe2O3). Telah dilakukan penelitian mengenai sifat magnetik bahan serbuk barium heksaferit dari pengaruh proses high-energy milling yang diikuti perlakuan annealing pada suhu 1000°C selama 3 jam, masing-masing pengukuran dilakukan pada suhu ruang. Hasil pengukuran pola difraksi sinar-x sebelum dan setelah proses milling 5 jam, 10 jam, 15 jam, 20 jam dan 30 jam terlihat telah terjadi deformasi terhadap struktur kristal yang ditunjukkan dengan tinggi puncak yang semakin menurun dan semakin melebar sehingga didapatkan sifat kemagnetan yang semakin menurun. Dari proses milling didapatkan nilai koersivitas intrinsik 1,68 kOe sebelum proses milling dan 1,13 kOe setelah proses milling 30 jam serta nilai magnetisasi remanen 42,5 emu/gram sebelum proses milling dan 8,16 emu/gram setelah proses milling 30 jam. Namun setelah hasil proses milling disertai perlakukan annealing pada suhu 1000°C selama 3 jam terlihat telah terjadi perbaikan dan penumbuhan struktur kristal yang mengalami deformasi akibat proses milling, dengan ditunjukkan semakin meningkatnya nilai koersivitas intrinsik yaitu 2,09 kOe sebelum proses milling dan 4,39 kOe setelah proses milling 30 jam serta nilai magnetisasi remanen setelah proses milling hingga 30 jam cenderung kembali seperti sebelum proses milling yaitu sekitar 43 emu/gram.

ABSTRACT

THE EFFECTS OF HIGH-ENERGY MILLING TO THEMAGNETIC PROPERTIES OFBARIUM HEXAFERRITE MATERIALS (BaO.6Fe2O3). The research to magnetic properties powders materials barium hexaferrite from the effects high-energy milling process followed through annealing process on temperature 1000°C for 3 hours, the maesurement was prepared on room temperature respectively. The maesurement results x-ray diffraction before and after of 5, 10, 15, 20 and 30 hours milling process due to the deformation of crystallite structure is shown by peaks descend more and width more with the magnetic properties is descend more. From milling process resulted the intrinsic coersivity 1.68 kOe before milling process and 1.13 kOe after the milling process on 30 hours as well as the magnetization remanence 42.5 emu/gram before milling process and 8.16 emu/gram after milling process on 30 hours. However the result after milling process and followed the annealing process on temperature 1000oC for 3 hours shows has been recover and crystallite growth the experience deformation the milling process effects, shown with more increased the intrinsic coersivity 2.09 kOe before milling process and 4.39 kOe after the milling process on 30 hours as well as the magnetization remanence after milling process up to 30 hours inclined as before milling process that is about 43 emu/gram.