静电纺丝法制备的Co_(0.6)Ni_(0.3)Cu_(0.1)Fe_2O_4和Co_(0.6)Ni_(0.3)Zn_(0.1)Fe_2O_4纳米纤维的结构及磁性能

Structure and Magnetic Properties of Electrospun Co_(0.6)Ni_(0.3)Zn_(0.1)Fe_2O_4 and Co_(0.6)Ni_(0.3)Cu_(0.1)Fe_2O_4 Nanofibers

采用静电纺丝技术制备出表面光滑、直径均匀的Co_(0.6)Ni_(0.3)Cu_(0.1)Fe_2O_4/PVP和Co_(0.6)Ni_(0.3)Zn_(0.1)Fe_2O_4/PVP纳米纤维前驱丝,经500~900℃煅烧后得到Co_(0.6)Ni_(0.3)Cu_(0.1)Fe_2O_4和Co_(0.6)Ni_(0.3)Zn_(0.1)Fe_2O_4纳米纤维。用TG-DSC、XRD、SEM及VSM现代测试分析手段对Co_(0.6)Ni_(0.3)Cu_(0.1)Fe_2O_4和Co_(0.6)Ni_(0.3)Zn_(0.1)Fe_2O_4纳米纤维的结构、形貌及磁学性能进行测试表征。结果表明:在空气气氛中经500~900℃煅烧后可得到纯尖晶石相、结晶度良好的纳米纤维或短纤维;当温度为700℃时,Co_(0.6)Ni_(0.3)Cu_(0.1)Fe_2O_4和Co_(0.6)Ni_(0.3)Zn_(0.1)Fe_2O_4纳米纤维的形貌细长而光滑且直径相对均匀,大约为80nm;此时Co_(0.6)Ni_(0.3)Cu_(0.1)Fe_2O_4纳米纤维则保有较高的剩磁比(M_r/M_s)及矫顽力,分别为0.56和1 088.87Oe。在500℃、600℃、700℃、800℃、900℃煅烧后,Co_(0.6)Ni_(0.3)Zn_(0.1)Fe_2O_4纳米纤维的饱和磁化强度分别比Co_(0.6)Ni_(0.3)Cu_(0.1)Fe_2O_4纳米纤维增大了14.5%、7%、16%、10.7%、8%,而矫顽力则分别降低了38%、51%、50%、46%、46.7%。两种纳米纤维的饱和磁化强度及矫顽力存在差异,为CoNi铁氧体在电磁方面的应用提供了很好的参考。

In this paper,the precursor of Co_（0.6）Ni_（0.3）Cu_（0.1）Fe_2O_4/PVP and Co_（0.6）Ni_（0.3）Zn_（0.1）Fe_2O_4/PVP nanofibers with uniform diameter and smooth surface were prepared by electrospinning technique.Then the Co_（0.6）Ni_（0.3）Cu_（0.1）Fe_2O_4/PVP and Co_（0.6）Ni_（0.3）Zn_（0.1）-Fe_2O_4/PVP nanofibers were obtained via heat treatment at 500—900℃.The phase,morphology,structure and magnetic properties of the resultant Co_（0.6）Ni_（0.3）Cu_（0.1）Fe_2O_4and Co_（0.6）Ni_（0.3）Zn_（0.1）Fe_2O_（4 ）nanofibers were characterized by TG-DSC,XRD,SEM and VSM respectively.The results show that the pure phase and well crystallized Co0.6Ni0.3Cu0.1Fe2O4and Co0.6Ni0.3Zn0.1Fe2O4nanofibers or staple fibers can be obtained after heat treatment in the air by heat treatment at 500—900℃.When the temperature is at 700℃,the diameter of Co_（0.6）Ni_（0.3）Cu_（0.1）Fe_2O_（4 ）and Co_（0.6）Ni_（0.3）Zn_（0.1）Fe_2O_（4 ）nanofibers with smooth surface is about 80nm,and moreover,the Co_（0.6）Ni_（0.3）Cu_（0.1）Fe_2O_（4 ）nanofibers retain a high remanence ratio（M_r/M_s）and a coercivity of 0.56and 1 088.87Oe respectively.At500℃,600℃,700℃,800℃,900℃,Co_（0.6）Ni_（0.3）Zn_（0.1）Fe_2O_4nanofibers exhibit the intensities of saturation magnetization which are 14.5%,7%,16%,10.7%,8%higher than those of Co_（0.6）Ni_（0.3）Cu_（0.1）Fe_2O_4nanofibers respectively,as well as the coercive forces which are 38%,51%,50%,46%,46.7%lower than Co_（0.6）Ni_（0.3）Cu_（0.1）Fe_2O_（4 ）nanofibers respectively.The differences of saturation magnetization and coercivity of the two nanofibers provide a good reference for electromagnetic applications of CoNi ferrite.