Nickel Zinc Copper Ferrite Nanofibers Fabricated By Electrospinning:Its Structure And Magnetic Properties Research

Electrospinning is a simple and practical preparation modern technologies of magnetic nano fiber.By strictly controlling the process conditions and strictly accurate stoichiometric ratio between the elements. The conditions of the precursor spinning can be prepared easier than the configuration successfully for a uniform diameter, good appearance, good continuity of nanofibers. Electrospinning method can be prepared by a single tube, multi-tube, core-shell structure and is more consistent with the structure of the magnetic nano-fibers, thus preparing a nanofiber production method has broad application prospects.The thesis of PVP and a solution of DMF as a viscous configuration and a complexing agent, a nitrate as were the main raw material of metal ions, ethanol and distilled water as the solvent of the configured solutions solvents, and successful by electrospinning We prepared two different Ni_0.3Cu_0.1Zn_0.6Fe₂O₄ and Ni_0.3Cu_0.1Zn_0.6Sm_0.05Fe_1.95O₄ magnetic fiber. At the same firing temperature, preparing two the magnetic nanofibers Ni_0.3Cu_0.1Zn_0.6Fe₂O₄ nanofibers make Ni_0.3Cu_0.1Zn_0.6Sm_0.05Fe_1.95O₄ magnetic structure, morphology, thermal decomposition Comparative study and magnetic properties.In the experiment, we use modern materials analysis methods, mainly useful for X-ray diffraction, X-ray energy dispersive spectroscopy（EDS）, thermogravimetry-differential scanning calorimetry analyzer（TG-DSC）,electron microscopy（SEM）, VSM the two prepared magnetic nano-fiber structure, to analyzed composition thermal decomposition process, morphology, structure and magnetic properties of the tubular comprehensive research system.Ni_0.3Cu_0.1Zn_0.6Fe₂O₄ magnetic nanofibers was prepared by electrospinning in air after500℃⁹00℃ calcined to obtain pure phase, well crystallized, uniform diameter.Ni_0.3Cu_0.1Zn_0.6Fe₂O₄ magnetic nanofiber fiber is completely decomposed at 450℃, two larger exothermic internet presence was in 200 410℃; Ni_0.3Cu_0.1Zn_0.6Fe₂O₄ magnetic nano-fibers was at a low temperature state, such as 500℃ and 600℃, the fiber morphology is good,uniform diameter, smooth surface, fiber diameter between about 18nm-30 nm, but when it was at high temperature, the prepared Ni_0.3Cu_0.1Zn_0.6Fe₂O₄ magnetic nano-fibers and fracture porosity phenomenon; as the temperature increases, the better the degree of crystallization at900℃, the crystallinity of the best, no impurity peak performance for pure spinel phase.Characterization VSM from the discovery, prepared Ni_0.3Cu_0.1Zn_0.6Fe₂O₄ nanofibers hysteresis loop of soft magnetic material have a characteristic feature, an elongated shape, the coercive force is small, and the saturation magnetization is relatively large. In a temperature range of 500 ℃ to 900 ℃, the saturation magnetization increases successively assertive,coercive force and residual magnetization happened after the first increase and then decrease trend. When 700 ℃, the maximum coercivity is 31.13 Oe. Ni_0.3Cu_0.1Zn_0.6Fe₂O₄ conduct rare earth element samarium doped, Ni_0.3Cu_0.1Zn_0.6Sm_0.05Fe_1.95O₄ fiber prepared magnetic energy is different from Ni_0.3Cu_0.1Zn_0.6Fe₂O₄ fiber, the coercive force is smaller, when the sinteringtemperature reaches 600 ℃, magnetic nano-fiber morphology was better, fiber diameter is about 60-100 nm, with increasing temperature, especially when after 800 ℃, the surface morphology of the prepared magnetic nano fiber happened roughness fracture and pores phenomenon,after 900℃ calcined fiber surface is rougher and larger fiber grains.Ni_0.3Cu_0.1Zn_0.6Sm_0.05Fe_1.95O₄ magnetic nano-fibers at 500℃ to 900℃ have clear crystallization peak, indicating that at 500℃ cubic spinel ferrite phase has been basically formed, as the temperature rise higher and higher degree of crystallinity, at 900℃ crystallized elongated front, obviously, exhibit good. As the calcination temperature,Ni_0.3Cu_0.1Zn_0.6Sm_0.05Fe_1.95O₄ nano-magnetic fiber differences in magnetic properties above has shown, specifically, the saturation magnetization nanofibers is from 37.29 emu/g to53.30emu/g, the coercive force after the first increases and then decreases from the 0.76Oe31.13 Oe at from 500℃ to 800℃, and subsequently reduced to 20.41Oe; residual magnetization by a 0.38 emu/g increased 11.37emu/g and subsequently reduced to 8.18emu/g.