优越磁性能的SrFe_(12)O_(19)微管的模板法制备

Preparation of Superior Magnetic SrFe_(12)O_(19) Microtubules with Template Method

脱脂棉作模板,采用溶胶-凝胶法制备并在不同温度下煅烧后制得了SrFe12O19微管,并用原溶胶-凝胶法制得了六角型纳米SrFe12O19.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1～2μm之间的SrFe12O19微管,与原溶胶-凝胶法制备的六角型SrFe12O19相比,SrFe12O19微管的矫顽力提高了30%左右,比饱和磁化强度和剩余磁化强度提高了20%左右,最终制得了矫顽力、比饱和磁化强度和剩余磁化强度分别为547.2kA/m、70.1A·m2/kg和42.4A·m2/kg的纯六方磁铅石型SrFe12O19微管,并对微管的形成以及磁性能提高的原因做了解释.

The strontium ferrite microtubules were prepared by the solgel method using the absorbent cotton as template and calcined at different temperatures.And the hexagonal nano-SrFe12O19 was prepared by prime sol-gel method.The phase,morphology and particle diameter of samples were studied by XRD,SEM and TEM.The magnetic properties of samples were tested by VSM.It is found that the strontium ferrite microtubules are obtained through the absorbent cotton template.The microtubules is fabricated with the external diameter of 8μm to 13μm and the wall thickness of 1μm to 2μm.The coercive force and magnetization of the strontium ferrite microtubules are improved by 30%,20%,respectively.The coercive force,the specific saturation magnetization and residual magnetization of the microtubules are 547.2kA/m,70.1A·m^2/kg and 42.4A·m^2/kg,respectively.The formation mechanism of the microtubules are dicussed.