超声波辅助球磨纳米Mn_xMg_(1-x)Fe_2O_4的制备和表征

Preparation and Characterization of Mn_xMg_(1-x)Fe_2O_4 Nanoparticles by Ultrasonic-assisted Ball Milling

采用超声辅助球磨法制备了具有尖晶石相的纳米锰镁铁氧体Mn_xMg_(1-x)Fe_2O_4(x=0.2,0.5,0.8),并利用X射线衍射仪(XRD)、透射电子显微镜(TEM)、振动样品磁强计(VSM)、荧光强度测试仪、电导率仪对反应产物进行了一系列的表征.X射线衍射图谱表明当反应进行到60h,单相立方尖晶石结构已经完全形成.透射电子显微镜表明样品(x=0.2)粉末的平均尺寸在25nm左右.饱和磁化强度在x=0.5时达到最大的74.22emu/g,并且随着x值的增大,饱和磁化强度降低.在不同实验条件下,荧光强度和电导率有着明显的不同,其变化说明超声辅助球磨对反应有显著的耦合作用.

In this paper, a series of Mn-Mg ferrites with the formula MnxMg1-xFe2O4 （ x =0.2,0.5,0.8） have been successfully prepared by ultrasonic-assisted ball milling approach. The characterization of the samples has been done using room temperature X-ray diffraction （XRD）,transmission electron microscopy （TEM）, vibrating sample magnetometer （VSM）. The XRD results reveal that the formation of single-phrase ferrite is fully completed after 60 h. The TEM micrograph confirms that the average size of nanoparticles is about 25 nm. The maximum saturation magnetization of 74.22 emu/g is obtained when x =0.5, which decreases with the further Mn doping. The fluorescence measurements and electroconductivity detections reflect the reaction speed and confirm the coupling effect of ultrasonic and ball milling.