以Fe(NO_3)_3·9H_2O和Sr(NO_3)_2为原料在水溶液中形成溶胶,以脱脂棉为模板使溶胶在脱脂棉表面形成凝胶,煅烧后得到了SrFe1_2O_(19)微管,并对锶铁氧体进行La掺杂制得磁学性能优良的SrLa_xFe_(12-x)O_(19)(x=0～0.3).采用XRD, SEM和VSM对样品的结构、形貌及磁性能进行了表征.结果表明:制备的La掺杂锶铁氧体基本保留了棉花纤维的生物形态,其外径在8～13 μm之间,壁厚在0.5～1 μm之间.当煅烧温度确定时,随着x值的增大,样品的矫顽力和饱和磁化强度先增加后减小,但饱和磁化强度的变化滞后于矫顽力.
Fe(NO_3)_3·9H_2O and Sr(NO_3)_2 were used as starting materials to form sol in the water solvent and then the sol formed gel on the surface of the absorbent cotton template. The strontium ferrite micropipe was prepared by calcining the gel. The SrLaxFe_(12-x)O_(19)(x=0-0.3) micropipe sample with excellent magnetic properties was obtained by doping La. The microstructure, morphology and magnetic properties of the sample were characterized by XRD, SEM and VSM. Results show that the morphology of the La-doped strontium ferrite remained the organism morphology of cotton fiber on the whole. The external diameter of the micropipe was between 8 μm and 13 μm, and the wall thickness was between 0.5 μm and 1 μm. When the calcining temperature was constant, the coercive force and the saturation magnetization of the sample increased first, and then decreased with the increase of x value. But the change of the saturation magnetization lagged the coercive force.
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