磁铅石结构新钙系铁氧体的制备与磁性能

Preparation and Magnetic Properties of Novel Calcium Ferrite with Magnetoplumbite Type

摘要:

采用陶瓷法成功地制备了磁铅石结构新钙系铁氧体，利用X射线衍射分析仪（XRD），扫描电镜（SEM），振动样品磁强计（VSM）和B-H分析仪，对产物的晶型、结构、微观形貌和磁性能进行研究。结果表明，Ca2+-La3+-Co2+联合取代可以显著提高磁铅石结构铁氧体的磁性能。与镧钴锶铁氧体相比，剩磁、磁感应矫顽力、内禀矫顽力和最大磁能积均有明显的提高。这种烧结磁体变小、变薄后，仍能保持高的剩余磁通密度。

Abstract:

Novel calcium ferrites with magnetoplumbite structure were prepared by the ceramic technology. The structure, the morphology and the magnetic properties of the samples were investigated systematically by X-ray diffraction (XRD), scanning electron microscopy (SEM), vibrating-sample magnetometer (VSM) and B-H hysteresis curve measurements. The experimental results show that the magnetic properties of calcium ferrites with Ca2+-La3+-Co2+ substitution can be significantly improved. The remanence, the magnetic induction coercivity, the intrinsic coercivity and the maximum magnetic energy of calcium ferrites have a significant improvement compared with that of strontium ferrites substituted by La3+-Co2+. In addition, the high residual flux density of the magnet can be still kept even the sintered magnet is thin and small.