热分解法制备磁性介孔铁钴氧化物∗

摘要

通过控制金属草酸盐前驱体的热分解过程，用一步法合成了不同n(Fe)(Co)的铁钴尖晶石型介孔氧化物。利用XRD、TEM、BET 及振动样品磁强计等研究手段对样品的结构、性能进行了表征。实验表明，所制得的样品具有良好的介孔结构及磁性能。随着n(Fe)(Co)的升高，样品的比表面积和最可几孔径增大，饱和磁化强度增加。随着烧结温度增加，饱和磁化强度增加，比表面积降低。%Mes-structured Fe-Co oxides with different Fe/Co molar ratios have been successfully fabricated through one-step pyrolytic method using homogeneous complex oxalates as precursors.The prepared samples were characterized by X-ray diffraction (XRD),transmission electron microscopy (TEM),N2 adsorption/de-sorption and vibrating sample magnetometer techniques.It is shown that the prepared samples possessed homo-geneous mesopores and good magnetic properties.With the increase of Fe-Co molar ratios,the specific areas, the pore size at the maximum probability and the specific saturation magnetization (Ms )increased.In addition, the specific saturation magnetization (Ms )still increased but the specific areas decreased with calcining tempera-ture increasing.