溶胶-凝胶法制备的Sr_(1-x)La_(x)Fe_(12)O_(19)样品,用XRD、VSM和TEM研究了La~(3+)取代量对样品结构和磁性能的影响.实验发现,合适的La~(3+)取代量能很明显提升样品的比饱和磁化强度和内禀矫顽力,在取代量x=0.15,于850℃空气中热处理时得到理想的磁性能σ_s=74.1 Am~2/kg,H_(cj)=498.4 kA/m.
Influences of the substituted amount of La~(3+) on structure and magnetic properties of Sr_(1-x)La_(x)Fe_(12)O_(19) prepared by sol-gel method have been investigated by XRD, VSM and TEM. It is found that the suitable amount of La~(3+) substitution may remarkably increase saturation magnetization σ_s and intrinsic coercivity H_(cj). Optimum magnetic properties of σ_s = 74.1 Am~2/kg, H_(cj)= 498.4 kA/m are achieved with material of composition Sr_(0.85)La_(0.15)Fe1_(1.85)O_(19) heated at 850 ℃ in air.
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