【摘要】 以碳酸氢铵为沉淀剂,用反滴加共沉淀法获得前驱体,将前驱体在900℃下煅烧5 h,合成了Co∶Y3Fe5O12(YIG)及Ni∶Y3Fe5O12(YIG)。通过对YIG前驱体的TG-DTA分析结果表明,样品的晶相形成温度为778℃。利用XRD测试技术对样品结构进行表征,Y3Fe5-xRxO12中的x为0～0.15时,样品为立方相,Ia3d空间群,当x=0.25时转变为四方相。样品中Y3Fe5-xRxO12的掺杂浓度x高于0.15时均出现杂相。用振动磁强计测试样品的磁性质的结果表明,Y3Fe5-xNixO12和Y3Fe5-xCoxO12样品的比饱和磁化强度均随着掺杂量的增加而增大,但杂相的出现引起磁化强度降低,Y3Fe5-xCoxO12中x=0.25时,比饱和磁化强度最大值为22.6 A.m2/kg,Y3Fe5-xNixO12中x=0.25时,样品为单相比饱和磁化强度最大值为24.5 A.m2/kg。更多还原

【Abstract】 Co∶YIG and Ni∶YIG powder samples were prepared by decomposing the precursors at 900 ℃,which were obtained by coprecipitation with precipitator NH4HCO3.Analysis results of TG-DTA show that the R∶YIG phase was obtained at about 778 ℃.The phase structure of the powder was characterized with X-ray diffraction.The pure phase Y3Fe5-xRxO12 samples were obtained when x≤0.15.Y3Fe5-xRxO12 was a cubic lattice structure with Ia3d space group.The structure was transformed into tetragonal lattice structure when x=0.25.The impurity appeared when x>0.15.The saturated magnetization measured by VSM was enhanced with increasing doped-content x.However,the impurity phase would led to a decrease of saturated magnetization when the doped-content was too high.更多还原