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采用液相共沉淀法制备出平均粒径约17nm的掺镝铁氧体磁颗粒,在-60~85℃范围内,研究了样品的磁特性与温度的相关性。借助透射电镜(TEM)、X射线衍射仪(XRD)、超导量子干涉仪(SQUID)对产物的形貌、相结构、磁性能进行了表征。结果表明,磁颗粒的形貌多为类球型,主流粒径在15~18nm,相结构为面心立方尖晶石型。样品的饱和磁化强度(Ms)、矫顽力(Hc)随温度(T)的降低呈现出增大的变化规律,且在85~20℃范围内,温度降低,Ms、Hc的增幅较小;在20~-60℃范围内,Ms、Hc随温度的降低而显著提高。
Dysprosium ferrite magnetic particles with average particle diameter of about 17nm were prepared by liquid coprecipitation method. The correlation between magnetic properties and temperature was studied in the range of -60 ~ 85 ℃. The morphology, phase structure and magnetic properties of the product were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and superconducting quantum interference (SQUID). The results show that the morphology of magnetic particles is mostly spheroidal and the main particle size is in the range of 15-18 nm. The phase structure of the magnetic particles is face-centered cubic spinel. The saturation magnetization (Ms) and coercive force (Hc) of samples show an increasing variation with the decrease of temperature (T), and the temperature decreases with the increase of Ms and Hc within 85 ~ 20 ℃. In the range of 20 ~ -60 ℃, Ms and Hc increased significantly with the decrease of temperature.