【摘要】 对多晶Y₃Fe_5-xMn_xO₁₂（x=0.05和0.09）,得到300K下的中子衍射曲线。发现当x=0.05时,Mn³⁺离子占据16a和24d位置的几率分别为0.72和0.28;当x=0.09时,Mn³⁺离子全部占据16a位置;还得到两种组分16a和24d位置各自的磁矩值。 在外磁场（800—10KOe）下测量Y₃Fe_5-xMn_xO₁₂（x=0—0.11）的磁化曲线,温度范围是1.5—300K。得到饱和磁矩值;并利用趋近饱和定律确定1.5K下的磁晶各向异性常数k₁值,发现|K₁|值随含锰量增加而减小。更多还原

【Abstract】 Neutron diffraction patterns have been obtained for polycrystalline Y3Fe5-xMnxO12 at 300 K. The fraction of octahedral sites occupied by Mn3+ has been found to be 0.72 for x=0.05 and 1 for x=0.09. The magnetic moments of tetrahedral sites and octahedral sites have been determined respectively for x=0.05 and 0.09. The observed magnetic scattering is consistent with the Neel model and the measured saturation moment.Magnetizations were measured as a function of applied magnetic field from 800 Oe to 10 kOe in the range of 1.5-300 K. Magnetic anisotropy were determined from the approach to saturation, \k₁\ was found to decrease with Mn3+ content.更多还原