低热固相反应制备一维棒状CoFe_2O_4及其电磁特性  

Preparation of One-Dimensional Stick-Like CoFe_2O_4 by Low-Heating Solid State Reaction and Its Electromagnetic Property

作　　者：庄稼[1] 刘承杰[1] 李焕明[1] 

机构地区：[1]西南石油大学材料科学与工程学院,成都610500

出　　处：《化学学报》2009年第5期409-414,共6页Acta Chimica Sinica

基　　金：国家自然科学基金(No.20271042);西南石油大学科研基金(No.2007XJZ044)资助项目

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.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.

关 键 词：铁酸钴 一维棒状 低热固相反应 磁导率 吸波材料 

分 类 号：TB34[一般工业技术—材料科学与工程]