基于YF30预烧料的La-Co掺杂锶铁氧体的磁性能研究

以市售YF30铁氧体预烧料为基料,采用陶瓷法制备了La-Co掺杂的M型锶铁氧体Sr1-xLaxFe12-xCoxO19(x=0～0.21)。通过X射线衍射和MATEST-2010H永磁(稀土)磁性材料自动测量仪研究La-Co掺杂量对材料结构与磁性能的影响。结果表明,在1210℃烧结时,Sr1-xLaxFe12-xCoxO19(x=0～0.21)均为单一的磁铅石相结构,适量La-Co掺杂明显改善了M型锶铁氧体的内禀磁性能;在1195℃烧结时,Sr1-xLaxFe12-xCoxO19锶铁氧体在x=0.15处获得最佳磁性能:Br=410mT,Hcj=358.0kA/m,(BH)max=32.2kJ/m3。

Study on the Magnetic Properties of La-Co Substituted Strontium Ferrites Based on YF30 Pre-sintered Powders

Based on the commercially available YF30 pre-sintered powders, La-Co substituted M-Type strontium ferrites Sr_(1-x)La_xFe_(12-x)Co_xO_(19)(x=0～0.21) were prepared by common ceramic processing. The influence of La-Co substitution on the crystal structure and magnetic properties were studied by means of X-ray diffraction (XRD) and MATS-2010H permanent magnet (rare earth) magnetic auto-measuring instrument. The results showed that Sr_(1-x)La_xFe_(12-x)Co_xO_(19)(x=0～0.21) ferrite sintered at 1210℃ is single-phase of magnetoplumbite crystal structure, and a suitable amount of La-Co substitution may remarkably improve the intrinsic magnetic properties of strontium ferrites; the optimal magnetic properties, B_r=410mT, H_(cj)=358.0kA/m, (BH)_(max)=32.2kJ/m~3, were obtained in Sr_(1-x)La_xFe_(12-x)Co_xO_(19) strontium ferrite with x=0.15 and sintered at 1195℃ .