花状钴镍合金的制备及其吸波性能

Preparation and microwave absorbent properties of flower-like CoNi

通过液相还原法成功地制备了花状钴镍合金磁性粉体。利用XRD、SEM和矢量网络分析仪对样品的结构、形貌和吸波性能进行了分析与测试。结果表明,样品为面心立方(fcc)结构,样品形貌为花状结构。而且通过改变柠檬酸钠的用量和钴镍摩尔比可以调控样品的吸波性能,当柠檬酸钠用量为4 mmol,钴镍摩尔比为1∶2时,制得的样品的最大回损值达到-34.4 dB,小于-5 dB的频宽为2 700 MHz,小于-10 dB的频宽为967 MHz。

The flower-like nickel clbalt alloy magntic powders are successfully synthesized by the liquid phase reduction method.The structure,surface morphology and electromagnetic parameters are characterized by XRD,SEM and vector network analyzer.The results show that the samples are face-centered cubic （fcc）structure.The morphology is leaflike structure.The absorption properties of the samples are controlled by changing the dosage of sodium citrate and the ratio of cobalt-nickel when the dosage of sodium citrate and molar ratio of cobalt and nickel are 4 mmol and 1 ∶ 2,respectively.The maximum return loss value of the obtained samples is-34.4 dB.The bandwidths less than-5 dB and -10 dB are 2 700 MHz and 967 MHz,respectively.