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本文用改进的尝试法成功地对未知晶系的Li_4UO_2(CO_3)3粉末晶体的X射线衍射数据指标化,该尝试法亦适用于六方、四方、正交、单斜和三斜晶系,根据指标化结果,得到该晶体的点阵参数,该点阵参数最后用最小二乘方作了精化。本文报导了五个重要结果:第一,Li_4UO_2(CO_3)3粉末晶体的X射线衍射数据指标化结果。第二,该晶体属于单斜晶系。第三,它们的晶胞参数是α=11.733(32),b=9.334(10)c=9.764(25),β=103.80(24)。第四,z=4,D_(cal)=3.056,D_(obs)=3.080,品质因数为7.3,⊿sin~2θ<0.00045第五,它的空间群属于10-c_(2h)~1-p(2/m)、3-c_2~1-p~2或6-c_3~1-pm。
In this paper, X-ray diffraction data of Li_4UO_2 (CO_3) 3 powder crystals of unknown crystal system have been successfully indexed by the improved method. The proposed method is also applicable to hexagonal, tetragonal, orthogonal, monoclinic and triclinic systems. The result of the indexing results in the lattice parameters of the crystal. The lattice parameters are finally refined by the least square method. Five important results are reported in this paper. First, the X-ray diffraction data of Li_4UO_2 (CO_3) 3 powders are used as indexing results. Second, the crystal belongs to the monoclinic system. Third, their unit cell parameters are α = 11.733 (32) , b = 9.334 (10) c = 9.764 (25) and β = 103.80 (24). Fourth, z = 4, D cald = 3.056, D obs = 3.080, the quality factor is 7.3, ⊿ sin ~ 2θ <0.00045. Fifthly, its space group belongs to 10-c_ (2h) ~ 1-p (2 / m), 3-c_2 ~ 1-p ~ 2 or 6-c_3 ~ 1-pm.