Sc掺杂对MnZn铁氧体的结构和磁性能的影响

Effect of Sc-doping on the microstructure and magnetic properties of MnZn ferrite

采用固相反应法制备了Sc元素掺杂的MnZn铁氧体,分别采用X射线衍射仪(XRD)、扫描电镜(SEM)、振动样品磁强计(VSM)以及LCR表等对样品的结构和磁性能进行表征。结果表明:对于Mn_(0.757)Zn_(0.107)Sc_(x)Fe_(2.136−x)O_(4)(x=0~0.07)材料,当x≤0.03时,样品均表现为单相立方尖晶石结构,x≥0.05时,样品中观察到另相衍射峰;x由0.01增加至0.07时,样品的晶格常数a呈增大趋势,平均晶粒尺寸D_(m)减小、孔隙率p相应增大;在x=0~0.07的考察范围内,饱和磁化强度M_(s)和矫顽力H_(c)均呈先增大后减小的趋势,当x=0.01时样品具有最大的饱和磁化强度92.7 A∙m^(2)/kg,x=0.03时样品呈现最大的矫顽力95.7 A/m;动态磁导率μ(100 kHz)由640减小至301,品质因数Q峰值由251减小至78。

Sc-doped MnZn ferrites,i.e.Mn_(0.757)Zn_(0.107)Sc_(x)Fe_(2.136−x)O_(4)(x=0-0.07),were prepared by solid-state reaction method.The structure and magnetic properties of the samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),vibrating sample magnetometer(VSM)and LCR meter,respectively.It is found that the samples with x≤0.03 show single-phase cubic spinel structure,and another phase diffraction peak is observed when x≥0.05.For Sc-doped samples with x increasing from 0.01 to 0.07,the lattice constant(a)increases slightly,moreover,the average grain size(D_(m))decreases,whereas the porosity(p)shows an increase.Furthermore,the saturation magnetization(M_(s))and coercivity(H_(c))of the samples increase initially and then decrease with increasing x from 0 to 0.07.As a result,the sample with x=0.01 and x=0.03 has the maximum saturation magnetization of 92.7 A∙m^(2)/kg,and the maximum coercivity of 95.7 A/m,respectively.Accordingly,dynamic permeabilityμ(100 kHz)gradually decreases from 640 to 301,and the peak value of quality factor Q declines from 251 to 78.