论文部分内容阅读
以NH_3·H_2O为沉淀剂,采用液相沉淀法制备出平均粒径约6~11 nm的钴镝铁氧体磁粒子。研究了低浓度Co~(2+)的掺杂对镝铁氧体结构和磁特性的影响,用XRF,XRD,TEM,VSM对样品的构建成分、微观结构、磁性能等进行了表征。结果表明:产物的构建成分主要为Fe_2O_3,Dy_2O_3,Co_3O_4,且其质量分数随Co~(2+)的掺入量不同而改变;Co~(2+)的掺杂不会改变镝铁氧体的微观结构,但磁特性会发生显著变化;随着Co~(2+)掺入量的增大,样品的粒径减小、饱和磁化强度(MS)降低、矫顽力(HC)和剩余磁化强度(M_r)显著提高。
Using NH_3 · H_2O as the precipitating agent, cobalt-dysprosium ferrite magnetic particles with average particle diameter of about 6 ~ 11 nm were prepared by liquid-phase precipitation. The effect of low concentration Co ~ (2+) doping on the structure and magnetic properties of dysprosium ferrite was studied. The composition, microstructure and magnetic properties of the sample were characterized by XRF, XRD, TEM and VSM. The results show that the main components of the product are Fe 2 O 3, Dy 2 O 3 and Co 3 O 4, and their mass fraction changes with the incorporation of Co 2+. The doping of Co 2+ does not change the content of Dysprosium ferrite However, the magnetic properties change significantly. With the increase of Co 2+ concentration, the particle size decreases, the saturation magnetization (MS) decreases, and the coercivity (HC) and residual Magnetization (M_r) increased significantly.