中文摘要：

以草酸、硝酸铁、硝酸钴为原料，加入不同聚合度的PEG，采用低热固相反应法制备出草酸铁和草酸钴的混合前驱物．在不同的温度（25，60，70，75℃），混合前驱物分别恒温反应2h，然后经450℃灼烧．对获得的粉体用XRD，SEM，激光粒度仪表征后证明：加入PEG400在75℃反应获得了长径比约为6～15范围，具有立方晶系尖晶石结构的棒状CoFe2O4铁氧体粉末．经测试电磁学性质发现，与粒状的CoFe2O4相比，棒状的CoFe2O4磁导率虚部在高频15-20GHz范围增加了近1倍，各向异性常数Ku则增加了近5倍．预示一维棒状结构的CoFe2O4作为吸波材料具有良好应用前景．

英文摘要：

The mixed precursors of oxalic iron and oxalic cobalt were prepared with oxalic acid, nitric iron, nitric cobalt and PEG of different polymerization degrees by a low-heating solid-state reaction, and reacted for 2 h at different temperature （25, 60, 70, 75 ℃）. A powder was obtained after calcination at 450 ℃, and characterized by XRD, SEM and laser granularity analysis. The stick-like CoFe2O4 powder was obtained with PEG400 at 75 ℃, with its proportion of length to diameter in a range of 6- 15, in a cube lattice spinel structure. The electromagnetic property was studied by the relative dielectric constant and relative magnetic permeability of the ferrite. The magnetic permeability of the stick-like CoFe2O4 is about once and the anisotropy constant is about 5 times larger than those grain-like one in a frequency range of 15-20 GHz. The stick-like CoFe2O4 has fine application foreground by way to materials of absorbing electromagnetic wave in future.