本文關(guān)鍵詞： 球形鈷顆粒 液相還原法 靜磁性能 電磁參數(shù) 吸波性能　出處：《稀有金屬材料與工程》2016年12期 　論文類型：期刊論文

【摘要】：以CoSO_4·7H_2O為鈷源,C_4H_4KNaO_6·4H_2O為絡(luò)合劑,N_2H_4·4H_2O為還原劑,NaOH為pH調(diào)節(jié)劑,CTAB為形貌控制劑,通過液相還原法成功制備出了具有特殊形貌的球形鈷顆粒。采用掃描電子顯微鏡(SEM),X-射線衍射儀(XRD),振動樣品磁強計(VSM)以及矢量網(wǎng)絡(luò)分析儀對鈷顆粒形貌、晶體結(jié)構(gòu)、靜磁性能以及微波頻段內(nèi)的電磁參數(shù)進行表征。研究表明鈷顆粒的比飽和磁化強度為123(A·m~2)/kg,矯頑力為176×79.6 A·m~(-1)。鈷顆粒在9.8、15 GHz時出現(xiàn)明顯介電損耗峰。鈷顆粒復(fù)磁導(dǎo)率實部隨著頻率增加逐漸降低,顯示了良好的頻散特性,而虛部在微波頻段內(nèi)呈現(xiàn)寬化的共振峰,經(jīng)分析為自然共振和交換共振共同作用所致。根據(jù)傳輸線原理計算反射損耗,發(fā)現(xiàn)當(dāng)厚度為5.5 mm時在12.4 GHz處得到最大反射損耗13.2 dB,此時有效損耗頻寬(≤10 dB)為1.6 GHz,表明實驗制備的鈷顆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，

本文編號：1503314