【作者】 王立群； 余大书； 何聚； 周荣江；

【机构】 天津师范大学物理与电子信息学院；

【摘要】 用溶胶——凝胶自燃烧法制备了掺杂La3+的Mn0.5Zn0.5LaxFe(2-x)O4(x=0,1,2,3 mol%)铁氧体纳米晶。用XRD、快——快符合正电子湮没寿命谱仪对目标产物进行了表征。结果发现:当0%≤x≤2%时,La3+的掺杂使得Mn-Zn铁氧体纳米晶由立方结构向六角结构转变。当x=3%时,La3+的进一步掺杂抑制了这种相变。而且,La3+在纳米晶体中所占据的位置和纳米晶体内部缺陷都与La3+的掺杂量有关。更多还原

【Abstract】 La3+-doped Mn-Zn fertile nanocrystalline structure was prepared by sol-gel auto-combustion processes. The samples were analyzed with XRD and positron annihilation technique. The results showed that the doping of La 3+ resulted in the phase change from spinel phase to hexangular phase withinO%f33xf332%. But the phase change was restrained when the ratio of La3+ was equal to 3%. In Addtion, the position of La3+ in Mn-Zn ferrite and the defects of Mn-Zn ferrite were related with La3+ dopant.更多还原