Synthesis and characterization of Sr(ZnZr)x Fe12−2xO19–PANI composites

Strontium zinc zirconium hexaferrites/polyaniline (Sr(ZnZr)xFe12−2xO19–PANI, x=0, 0.5, 1.0) composites were synthesized by oxidative chemical polymerization of aniline in the presence of ammonium peroxydisulfate (APS). The structure and morphology of the product was characterized by FTIR, TGA and SEM. The particle size of the core material was found to be about 250–500 nm. After coating with polyaniline, the particle size of Sr(ZnZr)0.5Fe11O19–PANI composites grew upto 0.5–1.0 μm. XRD of the ferrites indicated that the structure of the core materials is hexagonal, with lattice constants around 5.886–5.885 Å. It was found that the saturation magnetization (MS) and coercivity (HC) for Sr(ZnZr)xFe12−2xO19–PANI composites decreased after polyaniline coating. The composite under applied magnetic field, exhibited ferromagnetic hysteretic loops with high saturation magnetization (MS=18.9–3.8 emu/g) and coercivity (HC=3850.0–583.91 Oe).

► To date, there have not been any other detailed studies related to modifying the magnetic properties of conducting polyaniline coatings and strontium zinc zirconium hexaferrite composites (Sr(ZnZr)xFe12−2xO19/PANI) with our method.
► In this work, electromagnetic functionalized Sr(ZnZr)xFe12−2xO19/PANI composites were synthesized by oxidative chemical polymerization of aniline in the presence of ammonium peroxydisulfate (APS).
► The Sr(ZnZr)xFe12−2xO19 particles were magnetic cores obtained by aqueous combustion synthesis (ACS) in a glycine–metal nitrate sol–gel system.
► Polyaniline (PANI) was the conducting shell.