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中文摘要：
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。
英文摘要：
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.
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