Pengaruh Suhu Kalsinasi terhadap Struktur, Morfologi dan Sifat Magnet Barium Heksaferit dengan Doping Nikel dan Cobalt

Abstract

BaFe12-2xNixCoxO19 has been synthetized by co-presipitation method. The pollen of BaCl2, FeCl3, NiCl2 and CoCl2 were mixed and precipitated by using of NaOH 1M. The effect of %mol dopan and calcination temperature on the structure, morphology and magnetic characteristic was characterisized by using XRD, SEM, and VSM. The result of XRD analysis showed that dominant sample has majority peak with the main structure BaFe12O19 but for the other sample there was a forming of minority peak of barium monoferit as impurities. The angle movement observed from (114) showed that the peak of 2θ move to the bigger angle. So that it was improving the lattice parameter value. The temperature given influenced the structure BaFe12-2xNixCoxO19 which was not calcined structure as amorf and still paramagnetic, while other which calcined on the temperature of 750oC and 950oC structured became BaFe12O19. The data of VSM showed that the pure sample have the highest coercive value and decreasing as the adding %mol dopan. The variation of calcination temperature also causing the changed of magnetization value. The sample using calcination temperature 950oC has the smallest magnetization value. The adding of Co2+ and Ni2+ gave influence to morphology result.

BaFe12-2xNixCoxO19 telah disintesis menggunakan metode kopresipitasi kimia. Serbuk BaCl2, FeCl3, NiCl2 dan CoCl2 dicampur dan diendapkan dengan menggunakan presipitan larutan NaOH 1M. Pengaruh dari doping dan suhu kalsinasi pada struktur, morfologi dan sifat magnet dikarakterisasi menggunakan XRD, SEM dan VSM. Hasil dari analisa XRD menunjukkan bahwa semua sampel memiliki struktur utama BaFe12O19 heksagonal, namun pada sampel murni masih terbentuk fase impuritas. Pergeseran sudut ditinjau dari bidang (114) menunjukkan sudut 2θ bergeser ke arah yang lebih kecil. Data VSM menunjukkan bahwa sampel tanpa doping menunjukkan angka koersivitas tertinggi dan semakin menurun seiring meningkatnya konsentrasi mol dopan. Penambahan doping Co2+ dan Ni2+ juga diyakini akan mempengaruhi morfologi permukaannya.