Fe_3O_4纳米材料的制备与性能测定

Synthesis and Characteristic Determination of Nanosized Fe_3O_4 Powder

用化学还原-共沉淀法制备Fe3O4纳米材料,用表面活性剂进行表面包覆处理,用红外光谱(IR)、电子显微镜(SEM)、X射线能谱仪(EDX)、磁强计(VXM)、微波矢量网络分析仪对材料相关性能进行了测定。研究结果表明,表面包覆的Fe3O4粉末平均粒径66nm左右,饱和磁化强度比未包覆的Fe3O4粉末高14%;将包覆的Fe3O4涂在厚度为0 9mm的铝片上,测定吸波性能,发现纳米晶粒的Fe3O4比微米晶粒的Fe3O4有更好的微波吸收特性,在微波X波段具有较强的吸收,吸波强度和吸波频率范围随Fe3O4涂层厚度增加而增大,面密度≤2 1kg/m2。

Nanosized magnetic powder Fe_3O_4 was prepared employing a reduction-coprecipitation method,by which the synthesis and the surface covering of the powder were completed in one step.Infrared,scanning electron microscope and the analysis by vibrating-sample magnetometer were used to characterize the product.Experimental results show that this surface covered Fe_3O_4 powder has an average particle size of 66 nm.Its saturation magnetization intensity is 14.0% higher than that of the uncovered particle.While painted the powder on an aluminium plate to measure its wave absorption properties,the results show an excellent absorption effects for the microwave in the range 8 to 12 GHz.The absorption intensity enhanced and the absorption frequency range enlarged with the increase in the thickness of the powder paint.Its surface density is lower than 2.1 kg/m^2.