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以Sr(NO3)2和Fe(NO3)3·9H2O为原料与不同比例的柠檬酸在水溶液中形成溶胶,把溶胶滴于脱脂棉模板上,水分挥发后在脱脂棉表面形成凝胶,于不同温度下煅烧后制得了SrFe12O19微管.利用X射线衍射技术(XRD)﹑扫描电子显微镜(SEM)﹑透射显微镜(TEM)对样品的物相﹑形貌和粒径进行表征,并利用振动样品磁强计(VSM)对样品进行磁性能研究.结果表明:借助脱脂棉模板,采用溶胶凝胶法制备了外径在8～13μm之间,壁厚在0.5～2μm之间的SrFe12O19微管,柠檬酸的加入使得微管出现破裂,微管之间出现聚集,且管壁上出现大量孔洞,断面变松散,比表面积增加.但随着柠檬酸用量的增加,SrFe12O19微管的矫顽力和饱和磁化强度先提高后下降,当柠檬酸与金属离子的物质的量比为1∶1时850℃煅烧后制得了矫顽力、饱和磁化强度和剩余磁化强度分别为7115.1Oe、70.1emu/g和42.4emu/g的纯的六方磁铅石型SrFe12O19微管,并就柠檬酸对微管的形成以及磁性能的影响原理做了初步的研究.
Sol (Fe (NO3) 3 · 9H2O and Sr (NO3) 3 · 9H2O as raw materials and different proportions of citric acid were used to form sol in aqueous solution. The sol was dropped onto the absorbent cotton template. After the water was volatilized, a gel formed on the surface of the absorbent cotton. The SrFe12O19 microtubules were prepared after calcination.The phase, morphology and particle size of the sample were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) (VSM) was used to study the magnetic properties of the sample.The results showed that the addition of SrFe12O19 microtubules and citric acid with the outer diameter of 8 ~ 13μm and the wall thickness of 0.5 ~ 2μm by sol-gel method The microtubules ruptured, aggregated between the microtubules, and a large number of holes appeared on the tube wall, the cross section became loose and the specific surface area increased, but with the increase of the amount of citric acid, the coercivity and saturation magnetization of SrFe12O19 Increased and then decreased. When the molar ratio of citric acid to metal ion was 1: 1, the coercivity was obtained after calcination at 850 ℃, the saturation magnetization and remanent magnetization were 7115.1Oe, 70.1emu / g and 42.4emu / g of pure hexagonal magnetite type SrFe12O19 Pipe, citric acid and to the formation of microtubules and affect the principle of magnetic energy to do a preliminary study.