CTAB-assisted low-temperature synthesis of SrFe12O19 ultrathin hexagonal platelets and its formation mechanism

摘要: Abstract Single domain particles (50–150 nm) of the M-type strontium ferrite (SrFe 12 O 19 ) were synthesized via co-precipitation method using cetyltrimethyl ammonium bromide (CTAB) as a surfactant, followed by heat treatment at 900 °C for 2 h. The effects CTAB contents ( x  = 0, 1, 3, 6, 9 wt.%) on formation, structure, morphology and magnetic properties hexaferrite investigated. phase powders with ultrathin hexagonal platelet-like (thickness: 10–20 nm) obtained in existence whereas secondary α-Fe 2 3 was detected samples prepared without CTAB, exhibiting rod-like shape. Both saturation magnetization coercivity increased content up to  = 6 wt.% optimal values 68.7 emu/g 6620 Oe, respectively. These results implied that may act crystallization master, controlling nucleation growth crystals. Two distinct formation mechanisms have been proposed explain different SrFe particle morphologies. nanoparticles are promising building blocks hard magnets recordings.