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应用非自耗真空电弧炉制备稀土GdGa3-xMnx(x=0,0.1,0.2,0.3)系列合金.采用粉末X射线衍射(XRD)研究合金的相结构,利用晶面指数尝试法及最小二乘法(TREOR)对衍射数据进行晶面指标化,采用Rietveld全谱拟合分析方法测定了GdGa3-xMnx的晶体结构.结果表明,GdGa3-xMnx(x=0,0.1,0.2,0.3)主相结晶成六方型结构的合金化合物,空间群P6/mmm.Gd原子占据1a(0,0,0)晶位,Ga原子分别占据2d(1/3,2/3,1/2)和2e(0,0,z)晶位,Mn原子部分替代Ga占据2e晶位.应用振动样品磁强计(VSM)测量了GdGa3-xMnx样品的磁化曲线(M-H).在Gd-Ga-Mn体系中,Mn原子对磁性有贡献,在低Mn区合金呈顺磁性;随Mn含量增加,呈现出弱铁磁性和顺磁性的混合.在0~1.5 T磁场下对其M-H曲线进行拟合,随着Mn含量的增加,磁化率xP与饱和磁化强度Ms先增后减,而与外场相关的参数a,b,c先减后增,并且均在x=0.2时达到极值,说明Mn的掺杂对GdGa3-xMnx的磁性能产生了较大影响.
A series of rare earth GdGa3-xMnx (x = 0,0.1,0.2,0.3) alloys were prepared by non-consumable vacuum arc furnace.The phase structure of the alloy was investigated by X-ray powder diffraction (XRD) (TREOR), the crystal structure of GdGa3-xMnx was determined by Rietveld full spectrum fitting analysis.The results show that the main phase of GdGa3-xMnx (x = 0,0.1,0.2,0.3) crystallizes into Hexagonal structure of the alloy compounds, space group P6 / mmm.Gd atoms occupy 1a (0,0,0) crystal position, Ga atoms occupy 2d (1 / 3,2 / 3,1 / 2) and 2e (0, 0, z) sites, while the Mn atoms partially occupy the 2e sites instead of Ga. The magnetization curves (MH) of GdGa3-xMnx samples were measured by vibrating sample magnetometer (VSM) Which contributes to the magnetism and is paramagnetic in the low Mn region.With the increase of Mn content, it shows a mixture of weak ferromagnetism and paramagnetic.The MH curve is fitted under 0 ~ 1.5 T magnetic field.With the increase of Mn content , The magnetic susceptibility xP and saturation magnetization Ms first increase and then decrease, while the parameters a, b and c related to the external field decrease first and then increase, and reach the extreme value when x = 0.2, indicating that the doping of Mn on GdGa3-xMnx The magnetic properties produced a larger shadow .