Structural,Dielectric,and Magnetic Studies on Electrospun Magnesium Ferrite-Polyvinylidene Fluoride Core–Shell Composite Fibers

• Published in: Acta metallurgica sinica : English letters Vol. 27; no. 4; pp. 557 - 562
• Main Authors: Revathi, V., Dinesh Kumar, S., Chithra Lekha, P., Subramanian, V., Natarajan, T. S., Muthamizhchelvan, C.
• Format: Journal Article
• Language: English
• Published: Heidelberg The Chinese Society for Metals 01.08.2014; Springer Nature B.V
• Subjects: Aluminum; Characterization and Evaluation of Materials; Chemistry and Materials Science; Coercivity; Core-shell structure; Corrosion and Coatings; Dielectric constant; Dielectric loss; Electric fields; Electrospinning; Ferromagnetic resonance; Ferromagnetism; Fibers; Fluorides; Fourier transforms; Magnesium; Magnesium ferrites; Magnetic fields; Materials Science; Metallic Materials; Microwave absorption; Nanostructure; Nanotechnology; Organometallic Chemistry; Particle size; Polymers; Polyvinylidene fluorides; Scanning electron microscopy; Spectroscopy/Spectrometry; Spectrum analysis; Tribology; 复合纤维; 扫描电子显微镜; 电介质; 结构; 聚偏氟乙烯; 铁素体; 镁; 静电纺丝; Electrospinning; X-ray diffraction (XRD); Polymer composites; Microwave absorption; Dielectric properties; Magnetic properties
• ISSN: 1006-7191; 2194-1289
• DOI: 10.1007/s40195-014-0055-1

The sub-micron（of the order of 150 nm） thick core–shell composite fibers of magnesium ferrite-polyvinylidene fluoride are prepared by electrospinning.The loading of magnesium ferrite is varied from 1 to 10 wt%.The study results by X-ray diffraction,scanning electron microscope,and infra-red spectroscopy indicate the formation of core–shell structure and an enhancement in the amount of b-phase compared to a-phase in the polyvinylidene fluoride.The particle size of the magnesium ferrite in the fiber is evaluated to be 30 nm.The low frequency dielectric studies indicate that the addition of the magnesium ferrite increases the polarization resulting in the increase in the dielectric constant but decreases the dielectric loss.The magnetization measurements indicate an increased value of coercivity compared to bulk due to the nano-size of the magnesium ferrite.The microwave absorption at the ferromagnetic resonance increases with the increase in the concentration of magnesium ferrite.The resonance field is found to vary with the loading of MFO.