面心结构钴颗粒的制备及其表征

Synthesis and characterization of Co particle with FCC structure

采用一种新颖的方法-甲酸钠还原法成功制备出了纯fcc-Co。通过XRD、TEM以及VSM的结果,探讨了前驱体溶液中Co^(2+)浓度对Co纳米颗粒的相结构、微观形貌以及磁性能的影响。研究表明,随着Co^(2+)浓度在0.012~0.108mol/L范围内变化,均得到了单一的fcc-Co,当Co^(2+)浓度为0.108mol/L时,Co颗粒软磁性能最佳,Ms=163.8A·m^2/kg,Hci=10.4kA/m。此外,重点研究了fcc-Co的形成机制,发现使用甲酸钠作为还原剂所提供的还原速率(0.014mol/(L·h))以及缓慢的冷却速度是得到fcc-Co的主要原因。

Pure fcc-Co was successfully synthesized by a novel sodium formate reduction method.The effect of the concentration of Co2+on phase structure,morphology and magnetic properties of Co particles was investigated by using XRD,TEM and VSM.The pure Co without any impurity is found to stabilize always in fcc structure when the concentration of Co2+varies from0.012mol/L to0.108mol/L.The Co particles exhibit an excellent soft magnetic property,i.e.,M s=163.8A·m2/kg and H ci=10.4A/m,at the Co2+concentration of0.108mol/L.Moreover,it is revealed that the formation of pure fcc-Co is mainly attributed to the moderate reduction rate(about0.014mol/(L·h))using sodium formate as the reducing agent and slow cooling rate during the reaction.