改进Pechini方法制备锰锌铁氧体纳米颗粒及其电磁特性

Electromagnetic Characteristics of Mn-Zn Ferrite Nanoparticles Prepared by Modified Pechini Method

通过改进的Pechini方法制备了泡沫凝胶颗粒,然后在500℃下煅烧得到锰锌铁氧体纳米颗粒。借用XRD、TEM、ED及VSM对其形貌、结构和磁性能进行了分析,并与Pechini方法制得的锰锌铁氧体纳米颗粒进行比较。结果表明了改进方法得到的锰锌铁氧体分散性好,尺寸均匀,晶化程度高,颗粒直径范围为20～40 nm;在10 kOe处磁化强度高达40.6 emu.g-1。用矢量网络分析仪研究了不同方法合成的锰锌铁氧体在2～18 GHz范围内的电磁特性,结果表明了改进Pechini方法制得的锰锌铁氧体具有相对较高的介电常数和磁导率。

Mn-Zn ferrite nanoparticles were obtained by calcining foam gel particles at 500 ℃which were prepared by modified Pechini method.The structural and magnetic characteristics of the as prepared samples were analyzed by XRD,TEM,ED and VSM.Compared to Mn-Zn ferrite nanoparticles fabricated by Pechini method,the results showed that Mn-Zn ferrite nanoparticles prepared by modified Pechini method exhibited good dispersibility,uniform distributtion and good crystallinity,and the particle diameter is in the range of 20-40 nm;its saturation magnetization is 40.6 emu/g at the maximum magnetic field of 10 kOe at room temperature.The electromagnetic characteristics of Mn-Zn ferrites prepared by different methods were measured by vector network analyzer in the microwave frequency range of 2-18 GHz.The Mn-Zn ferrites prepared by modified Pechini method exhibited higher dielectric constant and permeability than that of Mn-Zn ferrites prepared by conventional Pechini method.