Mn_(0.2)Zn_(0.8)Fe_(2-x)Ce_xO_4铁氧体纤维的制备、结构及其磁性能

Preparation,structure and magnetic properties of Mn_(0.2)Zn_(0.8)Fe_(2-x)Ce_xO_4 ferrite fibers

以柠檬酸和金属盐为原料，采用有机凝胶一热分解法成功制备了Mn0.2Zn0．8Fe2-xrCexO4（x=0～0．04）系列铁氧体纤维。通过XRD、SEM和VSM等技术对产物进行了表征，研究了Ce抖掺杂对Mn—Zn铁氧体纤维的结构，微观形貌及磁性能的影响。结果表明，所制得的纤维轴向较为均匀，长径比较大，直径在0．5～3．5μm之间，组成纤维的晶粒平均尺寸为11．6～12．8nm。Ce^3＋掺杂没有引起Mn0.2Zn0．8Fe2-xrCexO4纤维结构的明显变化，仍为单一的立方尖晶石结构，但晶格常数和晶粒粒径随Ce^3＋掺入量的增加而略微增大。Ce抖掺杂使Mn-Zn铁氧体纤维的饱和磁化强度增大，矫顽力下降，软磁性能有所提高。

A serials of Mn0.2 Zn0.8 Fe2-xCe, O4 （x=0, 0.01, 0.02, 0.03, 0. 04） ferrite fibers were successfully prepared by the organic gel-thermal decomposition method using metal salts and citric acid as raw materials. The obtained ferrite fibers were characterized by X-ray diffraction （XRD）, scan electro microscopy （SEM） and vibrating sample magnetometer （VSM）. The effects of Ce3＋ doping on the structure, morphologies and magnetic properties of the Mn-Zn ferrite fibers were investigated. The results show that the Mn0.2Zn0.8Fe2-xCexO4 fibers composed of nanosized crystalline grains are featured with fine diameters between 0.5-3.5μm and high aspect ratios（length/diameter）, and the average crystal size ranges from 11.6-12.8nm. The Ce^3＋ doping has not resulted in crystal structural changes of the Mn-Zn ferrite and all the ferrite fibers as-prepared have a simple cubic spinel phase structure, but both the lattice constant and grain size increase slightly with increasing Ce^3＋ content. The substitution of Ce for Fe can lead to an increase in saturated magnetization and a decrease in coercivity, and improve the soft magnetic properties of Mn-Zn ferrite fibers to a certain extent.