掺杂稀土La的Fe-Co合金/石墨纳米复合物的室温磁性能研究

A Study on Room-Temperature Magnetic Properties of Fe-Co Alloy Doped With Rare Earth La/Graphite Nanocomposites

以水热法制备的掺杂不同量稀土 La 的铁钴合金/钴铁氧体纳米复合物为前驱体,通过与三聚氰胺在高纯氮气氛中发生固相反应合成出掺杂稀土 La 的 Fe-Co 合金/石墨纳米复合物。XRD表征结果显示,La 与 Fe,Co 形成了体心立方（bcc）结构的合金；由 TEM,HRTEM 观察出,掺杂 La的 Fe-Co 合金纳米颗粒尺寸范围为200~500 nm,且被石墨层包覆；VSM 室温磁性能测试结果说明,掺杂 La 的 Fe-Co 合金/石墨纳米复合物的饱和磁化强度随着 La 的掺杂量的增大先减小后增大,而矫顽力先增大后减小。

Rron-cobalt alloy/cobalt ferrite nanocomposites doped with rare earth La are produced by using the hydrothermal method.Then,with the nanocomposites as an precursor and through a solid phase reaction with melamine in high pure nitrogen,Fe-Co alloy doped with rare earth La/graphite nanocomposites are synthesized.XRD results show that La and Fe,Co form an alloy with a body centered cubic （BCC）structure.TEM,HRTEM observation indicates that the size range of the alloy of Fe and Co doped with rare earth La,with a graphite layer coating,is 200~500 nm.VSM tests of magnetic properties at room temperature show that the saturation magneti-zation of Fe-Co alloy doped with rare earth La/graphite nanocomposites increases after the first decrease as the amount of doped La increases,but the coercivity first increases and then decreases.