制备沸石基纳米非晶软磁材料的新方法及其磁性

首次以分步水热合成封装法于孔径分别为0.56,0.73和0.78nm的沸石ZSM-5,Naβ和NaY的孔道中成功地封装了强磁性材料SmCo5和铁氧体Fe3O4,并测得其磁滞回线及饱和磁化强度Ms,剩余磁化强度Mr和矫顽力Hc.实验结果表明,体相Fe3O的矫顽力为8117A/m.封装后减小至1114A/m;体相SmCo5的矫顽力为55863A/m,封装后减小至5491A/m,即由体相强磁性材料变为纳米非晶软磁材料,这是纳米粒子的小尺寸效应和量子尺寸效应所致.并由XRD,IR和磁滞回线对该材料进行了表征.

New Method for Preparing Zeolites Matrix Nanometer Noncrystal Soft Magnetic Materials and Their Magnetism

By using stepwise hydrothermal synthesis methods, magnetic materials Fe3O4and SmCo5were successfully assembled into the channels of zeolites ZSM-5, Naβ and NaY, whose apertures were 0. 56, 0. 73 and 0. 78 nm, respectively. Furthermore, their magnetic hysteresis loops and magnetism parameter, Ms, Mrand Hcwere determined satisfactorily. After being assembled, the coercivity Hcof block crystal Fe3O4was reduced from 8117 to 1114 A/m, while the coercivity Hc of block crystal SmCo5was reduced from 55863 to 5491 A/m. That shows the nanometer noncrystal soft magnetic materials are formed. It was caused by the quantum size effect of the nanometer particle. It was proved that the magnetic materials Fe3O4and SmCo5were assembled into the channels of the zeolites by XRD, IRand magnetic hys teresis loops.