摘要
首次以分步水热合成封装法于孔径分别为0.56,0.73和 0.78 nm的沸石ZSM-5,Naβ和NaY的孔道中成功地封装了强磁性材料SmCo_5和铁氧体Fe_3O_4,并测得其磁滞回线及饱和磁化强度M_s,剩余磁化强度M_r和矫顽力H_c。实验结果表明,体相Fe_3O_的矫顽力为8 117 A/m.封装后减小至1114 A/m;体相SmCo_5的矫顽力为55 863 A/m,封装后减小至5 491A/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.
By using stepwise hydrothermal synthesis methods, magnetic materials Fe3O4 and SmCo5 were 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, Mr and Hc were determined satisfactorily. After being assembled, the coercivity Hc of block crystal Fe3O4 was reduced from 8 117 to 1 114 A/m, while the coercivity Hc of block crystal SmCo5 was reduced from 55 863 to 5 491 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 Fe3O4 and SmCo5 were assembled into the channels of the zeolites by XRD, IR and magnetic hysteresis loops.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2003年第9期1633-1636,共4页
Chemical Journal of Chinese Universities
基金
内蒙古自治区自然科学基金(批准号:99159B)
