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

查看全文 作　　者：[1]V.Revathi;S.Dinesh [2]Kumar;P.Chithra [2]Lekha;[2]V.Subramanian;[2]T.S.Natarajan;[3]C.Muthamizhchelvan 机构地区：[1]New Horizon College of Engineering,Bangalore 560103,India;[2]Microwave Laboratory,Department of Physics,IIT Madras,Chennai 600036,India;[3]SRM University,Kattankulathur,Chennai 603203,India 出　　处：《Acta Metallurgica Sinica(English Letters)》索引2014年第27卷第4期,共6页 摘　　要：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. 关 键 词：聚偏氟乙烯 复合纤维 静电纺丝 铁素体 电介质 结构 镁 扫描电子显微镜