在水相体系中用化学共沉淀法制备出纳米掺镝铁氧体磁颗粒,利用透射电镜(TEM)观察了磁颗粒的形貌,X-射线衍射仪(XRD)确定了产物的相结构,超导量子干涉仪(SQUID)测试了样品的磁性能.在318 ～378K范围内,研究了温度变化对产物磁特性的影响.TEM图片和XRD图谱分析表明,样品的形貌近似球形,具有立方尖晶石型结构,平均粒径约18 nm左右.对产物的磁性能研究显示,318K时的饱和磁化强度(MS)为183.4 mT,温度升高MS呈现出降低的变化规律;318K时的矫顽力(HC)为0.345 mT,温度升高HC减小,超顺磁性的特性增强.
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