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本文论述了用强功率四国单晶衍射仅成功地测定的氟碳铈钡矿的二级超结构.氟碳铈钡矿(Ce_2Ba_3(CO_3)_5F_2)属单斜晶系,a_0＝21.338(3)、b_0＝5.0666(8)、C_0＝13.276(9)Α、β＝94.78(4)°、V＝1430Α~3、Z＝4,采用空间群P2,根据1916个独立的衍射点经多轮各向同性热振动参数最小二乘修正最后的偏离因子R＝0.07.Ba、Ce重原子具有 5种不同的配位形式,其配位数有10、11、12三种,平均键长Ba－O(F)=2.963~2.801Α,RE—O(F)＝2.580Α_。Ba、Ce的配位多面体沿(301)在(010)面上的投影方向以共棱及共面的方式按Ba－Ce－Ba－Ba－Ce－Ba-ce－Ba－Ba-Ce的顺序连接成链,其间由(CO_3)~2进一步连接成平行(010)方向的网层,位于Y＝0及Y＝1/2处的这样的网层通过共角顶或共棱的方式连接形成三维格架.
This paper deals with the secondary structure of barium bastnasite successfully determined by the single-crystal diffraction of tetragonal one with high power. Ce_2Ba_3 (CO_3) _5F_2 belongs to the monoclinic system, a_0 = 21.338 (3) Space group P2, based on the 1916 independent diffraction points after a number of rounds of each of the four (4) To the same sex thermal vibration parameters least square correction final deviation factor R = 0.07.Ba, Ce heavy atoms with five different coordination forms, the coordination number of 10,11,12 three, the average bond length Ba-O (F) = 2.963 ~ 2.801Α, RE-O (F) = 2.580Α_. The ordered polyhedrons of Ba and Ce along the projection direction of (301) on the (010) plane are arranged in a co-planar and coplanar fashion in the order of Ba-Ce-Ba-Ba-Ce-Ba-Ce-Ba-Ba-Ce (CO_3) ~ 2 are further connected in a parallel (010) direction, and the layers at Y = 0 and Y = 1/2 are connected by the formation of a common vertex or a co-ridge Three-dimensional grid.