| 氟碳铈钡矿Ba3Ce2(CO3)5F2晶体结构重测 |
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| 引用本文： | 杨主明.氟碳铈钡矿Ba3Ce2(CO3)5F2晶体结构重测[J].地质科学,1996,31(2):140-146. |
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| 作者姓名： | 杨主明 |
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| 作者单位： | 中国科学院地质研究所 北京 100029 |
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| 摘 要： | 氟碳铈钡矿Ba3Ce2(CO3)5F2的晶体结构原先被描述为Cm和P2空间群,经单晶X射线衍射方法重测为C2/m空间群;采用2339个独立反射,151个可变参数,R=0.034,Rw=0.05.经检测,未发现明显违反C心布拉维格子的反射;误差允许范围内位移椭球体与所定空间群相容。结构中的原子排列与化合物Ba3La2(CO3)5F2相似,可被描述为平行于(102)层间有序结构,层与层之间通过碳酸根相联结。
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| 关 键 词： | 氟碳铈钡矿 晶体结构 晶体化学 白云鄂博 |
| 收稿时间： | 1994-11-08 |
| 修稿时间： | 1994-11-08; |
STRUCTURE REDETERMINATION OF CEBAITE-(Ce),Ba_3Ce_2(CO_3)_5F_2 |
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| Yang Zhuming.STRUCTURE REDETERMINATION OF CEBAITE-(Ce),Ba_3Ce_2(CO_3)_5F_2[J].Chinese Journal of Geology,1996,31(2):140-146. |
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| Authors: | Yang Zhuming |
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| Institution: | Institute of Geology, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | he crystal structure of Cebaite-(Ce), Ba3Ce2(CO3)5F2,was previously described in space groups Cm and P2. Using single crystal X-ray diffraction it was refined in C2/m,2339 unique reflections, 151 variables, R = 0. 034, Rw = 0. 05. Reflections definitely violating the C-centered Brayals lattice were not detected; and displacement ellipsoids are compatible with the space group chosen within the limits of accuracy. The atomic arrangement compares very closely to that of synthetic Ba3La2(CO3 )5F2. It can be described as an intra - layer-ordered structure with layers parallel (102) that are interconnected by carbonate groups. |
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| Keywords: | Cebite-(Ce) Crystal structure Crystal chemistry Inner Mongolia China |
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