Synthesis and Optical Properties of Strontium Hexaferrite (SrFe12O19) Fibers by Electrospinning

Abstract

The strontium hexaferrite fibers (SrFe₁₂O₁₉) were synthesized by electrospinning using iron (III) nitrate, strontium nitrate and polyacrylonitrile (PAN) as precursors. The as-spun fibers were calcined at 900, 1000 and 1100 ºC for 8 h in air. The as-spun and calcined fibers were characterized by thermogravimetric-differential thermal analysis (TG-DTA), X-ray diffraction (XRD), Field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FT-IR) and UV-Visible diffuse reflectance spectroscopy (UV-Vis DRS). The TG-DTA results showed that completely decomposition of PAN and formation of the crystallization occurred above 500 ºC. The XRD and FT-IR results confirmed the crystalline phases of SrFe₁₂O₁₉ and impurity phase of  -Fe₂O₃ were detected. FE-SEM images showed that the SrFe₁₂O₁₉ fibers had porosity and rough surface with diameter about 500 – 1200 nm. UV-Vis DRS spectra showed that SrFe₁₂O₁₉ fibers exhibit the absorption bands in range of ultraviolet and visible light regions. The band gap energy of SrFe₁₂O₁₉ fibers is about 2.00 eV in different temperatures.