中文摘要：

以三氯化铁和醋酸钠为原料,采用水热法制备Fe_3O_4粉体,对比实心Fe_3O_4粉体在吸波性能上具备的优势。通过X射线衍射（XRD）分析Fe_3O_4粉体的物相结构;采用扫描电子显微镜（SEM）、透射电子显微镜（TEM）观测Fe_3O_4粉体的尺寸及形貌;使用矢量网络分析仪测试了同轴样品的电磁参数来计算泡状Fe_3O_4粉体的微波吸波性能。结果表明,制备的Fe_3O_4粉体为泡状结构,密度小于实心Fe_3O_4粉体,且介电常数实部明显升高。在0.5～18.0GHz频段,当厚度大于4mm时,其吸波性能相比实心Fe_3O_4粉体有一定优势。

英文摘要：

This paper, taking FeCl3 · 6H2O and CHaCOONa as source materials, prepares Fe3O4 powders by hydrothermal method to compare the superior of absorption with solid Fe3 O4 powders. The paper analy- zes the crystal structure of Fe3 O4 powders by X-ray diffraction （XRD）, and the size and the morphology of the prepared products by scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. The paper tests the electromagnetic parameters of coaxial samples by network analyzer to obtain the microwave absorption of porous Fe3 O4 powders. The results indicate that the density of porous Fe3 O4 powders is lower than that of the solid Fe3 O4 powders, and the real part of permittivity of porous Fe3 O4 powders is absolutely higher. When the thickness of samples is thicker than 4 ram, the absorption of pre- pared porous Fe3 O4 powders is definitely superior.