Preparation of Superior Magnetic SrFe12O19 Microtubules with Template Method

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 8 mu m to 13 mu m and the wall thickness of 1 mu m to 2 mu m. 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.