Effects of Mn2+ cations substitution in co-precipitated magnetic nanomaterial CoFe2O4 studied for crystalline structure and magnetics properties

The effect of MnxCo(1-x)Fe2O4 with x = 0, 0.25 and 0.5 as nanoparticles additives in magnethorheological fluid

“…The M S of Mn x Co (1-x) Fe 2 O 4 with x = 0,0.25 and 0.5 are 36.80 emu g −1 , 39.13 emu g −1 and 42.05 emu g −1 respectively. Due to substituting Co with Mn, Ion Mn 2+ made the Fe 3+ change from tetrahedral (A)site to octahedral (B)-site and form an A-O-B super-exchange interaction [40,47]. In figure 5(b), the VSM result of all MRF samples was presented.…”

“…The nanoparticles of manganese substituted cobalt in ferrite with different molar ratio 0, 0.25 and 0.5 (Mn x Co (1-x) Fe 2 O 4 with x = 0, 0.25 and 0.5) were synthesized with coprecipitation method [40]. The Co(NO 3 ), Mn(NO 3 ) dan Fe(NO 3 ) were mixed in 100 ml water with a magnetic stirrer at 300 rpm and 20 min.…”

“…Among these spinel ferrites, CoFe 2 O 4 has been proven to increase the rheological properties of MRF. CoFe 2 O 4 is known as a spinel ferrite that has moderate magnetic saturation, high coercivity, high Currie point, large magnetostrictive and high mechanical hardness [38][39][40][41][42][43]. However, CoFe 2 O 4 has the nature of hard magnetic properties that had high coercivity.…”

“…The high coercivity characteristic causes reduced MRF flow capability in off-state conditions. It is believed that by substituting Mn in CoFe 2 O 4 in different mole ratios, the saturated magnetization of the material will be modified and simultaneously decreasing the value of its coercivity [40,44,45]. Although the discussion of Mn metal substitution in the CoFe 2 O 4 compound has been reported in some literature [44][45][46][47], the use of this material as an additive in MRF has not been deeply studied.…”