采用溶胶-凝胶法制备了Co1-xNixFe2O4/SiO2(0≤x≤1.0)纳米复合材料.利用XRD,TEM,振动样品磁强计(VSM)和M(o)ssbauer谱测试了900℃热处理样品的结构,晶粒尺寸和磁性.结果表明,样品中Co1-xNixFe2O4铁氧体的平均晶粒尺寸在15-20 nm之间,Ni2+的掺杂引起CoFe2O4晶胞体积减小.VSM结果表明,随Ni2+含量的增加,样品的比饱和磁化强度和矫顽力变小.M(o)ssbauer谱表明,室温下各样品均处于磁有序状态,样品的内磁场随N2+含量的增加而变小.
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