Formation of Iron–Cobalt Oxide Nanoparticles Using the Ball Milling Method

Abstract

X-ray diffraction, Mössbauer analysis, and magnetic measurements  were  used  to  better understand  the  structural  and magnetic  properties  of  ball-milled  Fe_100-xCo_x  compounds  (x = 0,  3.5,  7.5, and 15). The effects of Co content and milling time on the iron oxidation process were investigated. Our research showed that the Fe oxidation rate increases with increasing Co content in the sample. The  sizes  of  magnetite crystallites in samples  with x = 0  and  15 were approximately  6 nm  after  100 h of  milling,  while  in  samples  with x = 3.5 and 7.5, they were larger than 12 nm. The saturation magnetization  at  room  temperature  after  100 h  of  milling was approximately 80 emu/g for samples with x = 0 and x = 15, and approximately 50 emu/g for samples with x = 3.5 and x = 7.5.