Synthesis of SrFe12O19 magnetic nanoparticles by EDTA complex method

Abstract

A modified polyacrylamide gel route was used to prepare SrFe₁₂O₁₉ magnetic nanoparticles; ethylenediaminetetraacetic acid (EDTA) was used as a carboxyl chelating agent. The phase purity, morphology and magnetic properties of as-prepared samples were analyzed via X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and vibrating sample magnetometery (VSM). XRD analysis indicates that high-purity SrFe₁₂O₁₉ magnetic nanoparticles can be synthesized at 700°C in air. The characteristic peaks of as-prepared sample at 210, 283, 321, 340, 381, 411, 432, 475, 532, 618, 686, and 726 cm^–1 were observed in Raman spectra. SEM and TEM show that the synthesized SrFe₁₂O₁₉ magnetic nanoparticles are uniform with the mean particle size of ~60 nm. VSM measurement shows that the maximum magnetic energy product (BH)_max of sample prepared using EDTA as a chelating agent is higher than that of sample prepared using citric acid as a chelating agent.