不同钴原料制备尖晶石型钴铁氧体及吸波性能研究

Preparation of Spinel Cobalt Ferrite from Different Cobalt Raw Materials and Its Absorbing Properties

采用硝酸钴、硫酸钴、氯化钴和乙酸钴分别作为CO^2+原料,通过水热法制备尖晶石型纳米钴铁氧体吸波材料。利用X射线衍射仪(XRD)、透射电镜(TEM)和矢量网络分析仪(VNA)对制备的钴铁氧体进行表征和分析。以CTAB为表面活性剂,晶化温度为180℃、晶化时间为8h,通过对比不同原料制备的钴铁氧体形貌、粒径、电磁损耗和吸波性能可以得出结论:以硝酸钴和氯化钴为原料制备出的钴铁氧体存在杂质峰,以硫酸钴和乙酸钴为原料可以制备出纯相纳米钴铁氧体,晶面距离分别为0.25246nm和0.25730nm,平均粒径为35nm和28.5nm。以乙酸钴为原料制备的钴铁氧体吸波反射率最小,为-8.3dB,电磁波吸波效果最好。

Spinel-type nano-cobalt ferrite absorbing materials were prepared by hydrothermal method using cobalt nitrate,cobalt sulfate,cobalt chloride and cobalt acetate as CO^2+raw materials.The cobalt ferrite was characterized and analyzed by X-ray diffractometry(XRD),transmission electron microscopy(TEM)and vector network analyzer(VNA).Taking CTAB as a surfactant,the crystallization temperature is 180℃,and the crystallization time is 8 h.By comparing the morphology,particle size,electromagnetic loss and absorbing properties of cobalt ferrite prepared from different raw materials,it can be concluded that the cobalt ferrite prepared from cobalt nitrate and cobalt chloride has impurity peaks.Pure nano cobalt ferrite can be prepared by using cobalt sulfate and cobalt acetate as raw materials.The crystal plane distances were 0.25246 nm and 0.25730 nm,respectively,and the average particle diameters were 35 nm and 28.5 nm.The minimum absorbing reflectance of cobalt ferrite prepared from cobalt acetate is-8.3dB,and the electromagnetic wave absorbing effect is the best.