Soft Chemistry Synthesis and Characterization of CoFe1.8RE0.2O4 (RE3+ = Tb3+, Er3+) Ferrite

Abstract

Nanosized CoFe1.8RE0.2O4 (RE3+ = Tb3+, Er3+) ferrites were obtained through wet ferritization method. These ferrites were characterized by X-ray diffraction (XRD), scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM/HR-TEM), Fourier transform infrared spectroscopy (FTIR), Mössbauer spectroscopy and magnetic measurements. The XRD results revealed that the average crystallite size is 5.77 nm for CoFe1.8Tb0.2O4 and 6.42 nm for CoFe1.8Er0.2O4. Distribution of metal cations in the spinel structure estimated from X-ray diffraction data showed that the Tb3+ and Er3+ ions occupy the octahedral sites. TEM images indicated the presence of polyhedral particles with average size 5.91 nm for CoFe1.8Tb0.2O4 and 6.80 nm for CoFe1.8Er0.2O4. Room temperature Mössbauer spectra exhibit typical nanoscaled cobalt ferrite spectra in good agreement with XRD and TEM data. The saturation magnetization value (Ms) is 60 emu/g for CoFe1.8Tb0.2O4 and 80 emu/g for CoFe1.8Er0.2O4. CoFe1.8RE0.2O4 nanoparticles showed similar antimicrobial efficacy against the five tested microbial strains, both in planktonic and biofilm state. The results highlight the promising potential of these types of nanoparticles for the development of novel anti-biofilm agents and materials.

Correlation between Cation Distribution and Magnetic and Dielectric Properties of Dy3+-Substituted Fe-Rich Cobalt Ferrite

“…43 Gingasu reported the correlation of the hyperfine magnetic field at the Mossbauer nucleus with particle size and observed it to decrease with the decrease of particle volume. 44 Theoretical correlation between the cation distribution from Mossbauer spectroscopy was reported by Shan et al 24 However, unfortunately, such an important theoretical study is not available for Fe-rich CFO with RM-ion, specifically Dy 3+ , substitution. Further, to the best of our knowledge, either experimental or theoretical studies on the correlation of detailed cation distribution and magnetic properties for Fe-CFO are not available at this time.…”

“…Gasemi et al have concluded the substitution of Fe at the B-site based on the variation of the area of the B-site . Gingasu reported the correlation of the hyperfine magnetic field at the Mössbauer nucleus with particle size and observed it to decrease with the decrease of particle volume . Theoretical correlation between the cation distribution from Mössbauer spectroscopy was reported by Shan et al However, unfortunately, such an important theoretical study is not available for Fe-rich CFO with RM-ion, specifically Dy 3+ , substitution.…”

Advances of Nanoparticles and Thin Films

“…A disadvantage of these methods is the use of precursors that are most often toxic, thereby limiting the scope of the application of the material. Since many nanoparticles are used in medicine and/or the cosmetic industry, new synthesis methods (the so-called green chemistry) have been developed that use safe and environmentally friendly nontoxic reagents [16,17]. A modern trend in the design of nanomaterials, especially magnetic nanomaterials, is the formation of hybrid structures of nanoparticle-polymer types that allow the functionalization and control of properties through the structure and composition of the polymer [18].…”