球形钴颗粒的制备及吸波性能研究（英文）

发布时间：2018-02-11 14:48

  本文关键词： 球形钴颗粒 液相还原法 静磁性能 电磁参数 吸波性能　出处：《稀有金属材料与工程》2016年12期 　论文类型：期刊论文

【摘要】：以CoSO_4·7H_2O为钴源,C_4H_4KNaO_6·4H_2O为络合剂,N_2H_4·4H_2O为还原剂,NaOH为pH调节剂,CTAB为形貌控制剂,通过液相还原法成功制备出了具有特殊形貌的球形钴颗粒。采用扫描电子显微镜(SEM),X-射线衍射仪(XRD),振动样品磁强计(VSM)以及矢量网络分析仪对钴颗粒形貌、晶体结构、静磁性能以及微波频段内的电磁参数进行表征。研究表明钴颗粒的比饱和磁化强度为123(A·m~2)/kg,矫顽力为176×79.6 A·m~(-1)。钴颗粒在9.8、15 GHz时出现明显介电损耗峰。钴颗粒复磁导率实部随着频率增加逐渐降低,显示了良好的频散特性,而虚部在微波频段内呈现宽化的共振峰,经分析为自然共振和交换共振共同作用所致。根据传输线原理计算反射损耗,发现当厚度为5.5 mm时在12.4 GHz处得到最大反射损耗13.2 dB,此时有效损耗频宽(≤10 dB)为1.6 GHz,表明实验制备的钴颗粒具有良好的吸波特性。
[Abstract]:Using CoSO_4 路7H _ 2O as cobalt source and C _ 4H _ 4H _ 2O _ 4KNaO _ 4H _ 2O as complexing agent N2H _ 4 路4H _ 2O as reducing agent and NaOH as pH regulator and CTAB as morphology control agent, Spherical cobalt particles with special morphology were successfully prepared by liquid-phase reduction method. The morphology and crystal structure of cobalt particles were investigated by scanning electron microscope (SEM), vibrating sample magnetometer (VSM) and vector network analyzer (VN). The magnetostatic properties and the electromagnetic parameters in microwave frequency band were characterized. The results showed that the specific saturation magnetization of cobalt particles was 123A 路mg / kg, and the coercivity was 176 脳 79.6A 路m-1 ~ (-1). The permittivity peak of cobalt particles appeared at 9.815 GHz and the real part of complex permeability of cobalt particles was obvious. As the frequency increases, it decreases, It shows a good dispersion characteristic, and the imaginary part presents a broad resonance peak in the microwave band, which is caused by the interaction of natural resonance and exchange resonance. The reflection loss is calculated according to the principle of transmission line. When the thickness is 5. 5 mm, the maximum reflection loss is 13. 2 dB at 12.4 GHz, and the effective loss band width (鈮，

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