Ba_xNi_(1–x)La_yFe_(12–y)O_(19)铁氧体的制备与磁性能研究

首先利用溶胶-凝胶法制备了BaxNi1–xFe12O19(x=0.2,0.4,0.6,0.8)样品,通过热重-差示扫描量热仪(TG-DSC)、X射线衍射仪(XRD)和振动试样磁强计(VSM)分析,确定了最佳煅烧温度和最佳Ba-Ni摩尔比。然后利用同样的方法制备了Ba0.6Ni0.4LayFe12–yO19(y=0,0.1,0.3,0.5)样品,利用场发射扫描电镜(FESEM)、XRD和VSM对产物进行表征分析。结果表明Ni2+取代Ba2+,进入其晶格内部,改变了铁氧体的磁性能。La3+的加入改变了铁氧体的矫顽力Hc、饱和磁化强度Ms和剩余磁化强度Mr。当y=0.3时,其Ms和Mr达到最大值,分别为51.0 A.m2/kg和32.3 A·m2/kg。

Preparation and magnetic properties of BaxNi1-xLayFe12-yO19

BaxNi1–xFe12O19(x = 0.2,0.4,0.6,0.8)was prepared by sol-gel process.The optimum calcinations temperature was determined by means of TG-DSC and X-ray diffraction(XRD).The optimum molar ratio of the Ba to Ni was chosen by analyzing the data of vibrating sample magnetometer(VSM).Ba0.6Ni0.4LayFe12–yO19(y = 0,0.1,0.3,0.5) samples was prepared by the same preparation method.The composition,microstructure,grain size and morphology of the products were characterized and analyzed through XRD,field emission scanning electron microscope(FESEM) and VSM.The results show that Ni2+comes into the crystal lattice,and affects the magnetic properties of ferrite.The coercive force Hc,saturated magnetization Ms and remanent magnetization Mr are changed when La3+is added.The Msand Mrcan reach the maximum value of 51.0 A.m2/kg and 32.3 A.m2/kg when y is 0.3.