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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.
Using oxalic acid, ferric nitrate and cobalt nitrate as raw materials, mixed precursors of iron oxalate and cobalt oxalate were prepared by low-temperature solid-phase reaction with different polymerization degree of PEG.At the same temperature (25, 60, 70, 75 ℃) , The mixed precursors were respectively heated for 2h and then calcined at 450 ℃. The obtained powders were characterized by XRD, SEM and laser particle sizer. The results showed that adding PEG400 at 75 ℃ resulted in an aspect ratio of about 6-15 , And a cubic CoFe2O4 ferrite powder with a cubic spinel structure was tested.The electromagnetic properties of the CoFe2O4 rod-shaped CoFe2O4 magnetic permeability imaginary part in the high frequency range of 15 ~ 20GHz increased nearly 1 compared with the granular CoFe2O4 Fold and the anisotropy constant Ku is increased by nearly 5 times, which indicates that CoFe2O4 with one-dimensional rod-like structure has a good application prospect as a wave absorbing material.