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采用溶胶-凝胶法结合静电纺丝技术制备了Ni0.5Zn0.5Fe2O4/SiO2复合纳米纤维.利用热重-差热分析、X射线衍射、场发射扫描电镜、高分辨透射电镜和振动样品磁强计研究了前驱体纤维的热分解及相转化过程以及焙烧温度和SiO2含量对目标纳米纤维的相组成、微观结构、形貌及磁性能的影响.结果表明,在450℃焙烧时,立方尖晶石结构已基本形成.随着焙烧温度由450℃升高到1000℃,(Ni0.5Zn0.5Fe2O4)90(SiO2)10复合纳米纤维中Ni0.5Zn0.5Fe2O4晶粒的平均尺寸以及纤维的比饱和磁化强度和矫顽力都增大.非晶SiO2的加入有效抑制了Ni0.5Zn0.5Fe2O4晶粒的生长,经900℃焙烧2h制得的Ni0.5Zn0.5Fe2O4/SiO2复合纤维中Ni0.5Zn0.5Fe2O4的平均晶粒尺寸由无SiO2时的81.6nm减小到SiO2含量为20%时的13.3nm,导致样品的磁畴结构由多畴向单畴转变,比饱和磁化强度单调下降,而矫顽力则呈现先增大后减小的趋势.同时,伴随着非晶SiO2含量的增加,复合纳米纤维的直径逐渐增大,表面也越趋光滑.
Ni0.5Zn0.5Fe2O4 / SiO2 composite nanofibers were prepared by sol-gel method combined with electrospinning technique.The thermogravimetric-differential thermal analysis, X-ray diffraction, field emission scanning electron microscopy, high resolution transmission electron microscopy and magnetic field The effects of calcination temperature and SiO2 content on the phase composition, microstructure, morphology and magnetic properties of the precursor nanofibers were investigated. The results show that the cubic spinel With the calcination temperature rising from 450 ℃ to 1000 ℃, the average size of Ni0.5Zn0.5Fe2O4 grains in (Ni0.5Zn0.5Fe2O4) 90 (SiO2) 10 composite nanofibers and the specific saturation of fibers Magnetization and coercivity both increase.The addition of amorphous SiO2 effectively inhibits the growth of Ni0.5Zn0.5Fe2O4 grains and Ni0.5Zn0 in Ni0.5Zn0.5Fe2O4 / SiO2 composite fibers prepared by calcining at 900 ℃ for 2h. The average grain size of 5Fe2O4 decreased from 81.6nm without SiO2 to 13.3nm with SiO2 content 20%, which led to the transition from multidomain to single domain, the monotonous decrease of saturation magnetization and the coercivity Force shows the first increase and then decrease the trend at the same time, with Crystalline SiO2 content increases, the diameter of the composite nanofiber is gradually increased, a smooth surface is also Yuequ.