Preparation and Magnetic Properties of Sr_(1-x)La_xFe_(12-x)Co_xO_(19) Nanofibers by Electrospinning

PVP/Sr1-xLaxFe12-xCoxO19(x=0-0.5) composite nanofiers were fabricated by Sol-Gel process and electrospinning technique.After high temperature calcination,Sr1-xLaxFe12-xCoxO19(x=0-0.5) ferrite nanofi-bers were successfully obtained.The morphology,phases,structure and magnetic properties of the nanofibers were characterized by Scanning electron microscope(SEM),Transmission electron microscope(TEM),X-ray diffraction(XRD) and Vibrating sample magnetometer(VSM).The results show that the samples have an uni-form diameter of 80-150 nm after calcined at 800℃.The Sr1-xLaxFe12-xCoxO19(x=0-0.5) ferrite nanofiers all exhibit a hard magnetic performance,and chemical composition have considerable influence on magnetic properties of these ferrite nanofibers.The Sr1-xLaxFe12-xCoxO19(x=0-0.5) ferrite nanofiers exhibit M-type strontium ferrites,CoFe2O4 phase and LaFeO3 phase at x≥0.3.The substitutions of La3+ and Co2+ obviously increase the magnetic properties of the as-prepared samples at x≤0.1,the coercivity(Hc),saturation magneti-zation(Ms) and remanent magnetization(Mr) of Sr0.9La0.1Fe11.9Co0.1O19 nanofibers are 432.02 kA/m,54.7 A.m2/kg,28.9 A.m2/kg,respectively.The magnetic properties of the fibers increase significantly,com-pared with that of the Sr0.9La0.1Fe11.9Co0.1O19 powder samples.