作　　者： ; ; ; ; (刘浩梅）;

机构地区： 湖南工业大学包装与材料工程学院包装新材料与技术重点实验室

出　　处： 《高等学校化学学报》 2010年第3期447-451,共5页

摘　　要： 利用溶剂热法,在醋酸钠静电保护剂的辅助下,成功制备出Fe3O4和Zn2+掺杂型Zn0.07Fe2.93O4纳米晶.利用X射线衍射仪和扫描电子显微镜等对样品的晶体结构、粒径、形貌和化学组成进行了分析.结果表明,所得纳米晶的粒径均匀,形貌为球形,分散度好;Zn0.07Fe2.93O4纳米晶的平均粒径(70 nm)明显小于Fe3O4(170 nm).磁性能测量结果表明,室温下Zn0.07Fe2.93O4的饱和磁化强度(54.2 A.m2.kg-1)小于Fe3O4(81.6 A.m2.kg-1).利用矢量网络分析仪对样品的电磁性能和吸波性能进行了研究.结果表明,Zn2+掺杂型Zn0.07Fe2.93O4纳米晶的吸波性能优于Fe3O4,前者的最大吸收峰(-19.3 dB)大于后者(-9.8dB),且吸收峰低于-10 dB的峰宽达2.5 GHz. Fe3O4 and Zn1-xFe2＋xO4 nanocrystallines were successfully prepared using NaAc as protective reagents via solvothermal method.The structure,size,morphology and chemical composition of the products were investigated in detail by X-ray diffraction（XRD） and scanning electron microscopy（SEM）.The results indicate that the monodisperse nanocrystallines are nanospheres and the averaged size of Zn0.07Fe2.93O4（70 nm） is smaller than that of Fe3O4（170 nm）.The magnetic properties of the sample were investigated and revealed that the saturation magnetization（54.2 A／5m2／5kg-1） of Zn0.07Fe2.93O4 nanocrystalline was smaller than that of Fe3O4（81.6 A／5m2／5kg-1）.The electromagnetic performance and microwave adsorption efficiency of both nanocrystallines were measured by a vector network analyzer（VNA） technique in a frequency region 2—18 GHz.The results indicate that Zn0.07Fe2.93O4 nanocrystallines exhibit better microwave adsorption efficiency.For example,the Zn0.07Fe2.93O4 nanocrystalline,the reflection loss maxium is 19.3 dB,almost equal to the double values of Fe3O4（9.8 dB）,and the bandwidth with a reflection loss more than 10 dB is up to 2.5 GHz.

关 键 词： 四氧化三铁 纳米晶 溶剂热 电磁性能

领　　域： [理学] [理学]