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通过X射线衍射分析和磁测量研究了Gd Fe Co Cr四元系中对应于化学式Gd3(Fe ,Co ,Cr) 2 9且Gd含量为一定值的截面内富Fe,Co区的相关系 ,重点探索了高Co含量 3∶2 9型化合物合成的可能性 ,研究了 3∶2 9型Gd3(Fe1 -xCox) 2 9-yCry 化合物的结构与磁性 .研究结果表明 ,获得 3∶2 9型单相Gd3(Fe1 -xCox) 2 9-yCry 化合物的范围为 :y =5 ,0≤x≤ 0 .7;y =5 .5 ,0 .7≤x≤ 0 .8和y =6 ,0 .8≤x≤ 0 .9.基于对Gd3(Fe1 -xCox) 2 9-yCry 化合物成相条件的研究 ,成功地合成了纯Co基Gd3Co2 9-yCry 化合物 ,其固溶范围为 6 .5≤y≤ 7.3.3∶2 9型单相Gd3(Fe1 -xCox) 2 9-yCry 化合物的晶体结构都属于单斜晶系 ,Nd3(Fe,Ti) 2 9型结构 ,空间群为A2 m .得到 3∶2 9型单相Gd3(Fe1 -xCox) 2 9-yCry 化合物的固溶极限即Co含量的极大值与稳定元素Cr含量有关 .Co原子的含量越高 ,所需稳定元素Cr的含量越大 .值得注意的是 ,用Co原子替代Fe原子会导致Gd3(Fe1 -xCox) 2 9-yCry 化合物磁晶各向异性的显著改变 .当x≥ 0 .4时 ,化合物的磁晶各向异性从易面型转变为易轴型
The relationship between Fe-rich and Co-rich regions in Gd Fe Co Cr quaternary system corresponding to the chemical formula Gd3 (Fe, Co, Cr) 2 9 with a constant Gd content was studied by X-ray diffraction analysis and magnetic measurements. The possibility of synthesizing 3: 2 9 type compound with high Co content was explored, and the structure and magnetism of the 3: 9 9 type Gd3 (Fe1-xCox) 2 9-yCry compound were studied.The results show that 3: The range of the phase Gd3 (Fe1-xCox) 2 9-yCry compound is: y = 5, 0≤x≤0.7; y = 5.5, 0.7≤x≤0.8 and y = 6,0. 8≤x≤0.9 Based on the phase transition of Gd3 (Fe1-xCox) 2 9-yCry compounds, the pure Co-based Gd3Co2 9-yCry compound has been successfully synthesized and its solid solution range is 6.5. ≤ 7.3.3:2 The crystal structure of 9 9 single-phase Gd3 (Fe1-xCox) 2 9-yCry belongs to the monoclinic and Nd3 (Fe, Ti) 2 9 structure with space group A2 m. : 2 The maximal value of Co concentration, which is the solution limit of 9-type single-phase Gd3 (Fe1-xCox) 2 9-yCry compound, is related to the content of stable elemental Cr. It is worth noting that the replacement of Fe atoms with Co atoms leads to the formation of Gd3 (Fe1-xC ox) 2 9-yCry compound magnetocrystalline anisotropy of the significant change.When x ≥ 0.4, the magnetocrystalline anisotropy of the compound from the easy-surface type into the easy-axis type