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采用溶胶凝胶法合成了在骨架中含有8-Fe_2O_3纳米颗粒的SBA-15介孔材料,并采用浸渍法在介孔孔道中引入Co_3o_4和CoFe_2O_4纳米颗粒。表征结构显示掺杂的纳米磁性颗粒湿合成样品产生铁磁性,饱和磁化强度来源于亚铁磁的CoFe_2O_4和自旋倾斜反铁磁的α-Fe_2O_3纳米颗粒,而反铁磁的Co_3o_4对介孔材料的矫顽力具有较大的影响。由于Fe-SBA-15与掺杂SBA-15的饱和磁化强度之和要远小于掺杂的Fe-SBA-15样品,说明在不同的纳米磁性颗粒之间存在交换耦合作用,使磁性增强。
SBA-15 mesoporous materials containing 8-Fe_2O_3 nanoparticles in the framework were synthesized by sol-gel method. Co_3o_4 and CoFe_2O_4 nanoparticles were introduced into mesoporous channels by impregnation. The characterization of the structure shows that the doped nano-magnetic particles produce ferromagnetism in the wet synthesized sample, the saturation magnetization is derived from ferrimagnetic CoFe 2 O 4 and spin-on-antiferromagnetic α-Fe 2 O 3 nanoparticles, while the antiferromagnetic Co 3 O 4 on mesoporous materials The coercivity has a greater impact. Since the sum of saturation magnetization of Fe-SBA-15 and doped SBA-15 is much smaller than that of doped Fe-SBA-15 sample, it shows that there is exchange coupling between different magnetic nano-particles to enhance magnetic property.