Crystal structure of natural non-metamict Ti- and Fe2+-rich chevkinite-(Ce)
文献类型：期刊论文
| 作者 | Li, GW ; Yang, GM ; Ma, ZS ; Shi, NC ; Xiong, M ; Fan, HF ; Sheng, GF |
| 刊名 | ACTA GEOLOGICA SINICA-ENGLISH EDITION
 |
| 出版日期 | 2005 |
| 卷号 | 79期号:3页码:325 |
| 关键词 | ITOIGAWA-OHMI-DISTRICT NIIGATA PREFECTURE PERRIERITE MINERALS ANALOG JAPAN |
| ISSN号 | 1000-9515 |
| 通讯作者 | Li, GW: China Univ Geosci, Beijing 100083, Peoples R China. |
| 中文摘要 | The crystal structure of non-metamict Ti- and Fe2+-rich chevkinite-(Ce) has been redetermined with the single-crystal sample collected from Bayan Obo, Inner Mongolia, China. The chemical formula of the sample is Ce4Fe2Ti3Si4O22. The crystals are monoclinic with the unit cell parameters a = 13.4656(15) angstrom, b = 5.7356(6) angstrom, c = 11.0977(12) angstrom, beta= 100.636(2)degrees, V = 842.39 (16) angstrom(3) and Z = 2. The structures of Ti- and Fe2+-rich chevkinite-(Ce) were refined with space groups P2(I)/a and C2/m. Least-squares refinement results show that both structural models of Ti- and Fe2+-rich chevkinite-(Ce) are very good, R[F-2> 2 sigma(F-2)] =0.027 with P2(1)/a and R[F-2> 2 sigma(F-2)] =0.021 with C2/m. In order to illustrate the relationship between the two space groups P2(1)/a and C2/m, the distribution of diffraction intensities was inspected. Pseudo extinction was found, i.e., reflections with h+k=2n are systematically strong, while those with h+k=2n+1 are weak. By neglecting the systematically weak (h+k=2n+1) reflections the space group becomes C2/m. There is a mirror plane in the C2/m perpendicular to the b axis. However, oxygen atoms in the P2(1)/a model are of a symmetrical relationship with the corresponding pseudo mirror plane. It is concluded that the crystal structure of non-metamict Ti- and Fe2+-rich chevkinite-(Ce) is a superstructure with the space group of P2(1)/a, which is of pseudo symmetry corresponding to the space group C2/m. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2013-09-17 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/35395]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Li, GW,Yang, GM,Ma, ZS,et al. Crystal structure of natural non-metamict Ti- and Fe2+-rich chevkinite-(Ce)[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2005,79(3):325. |
| APA | Li, GW.,Yang, GM.,Ma, ZS.,Shi, NC.,Xiong, M.,...&Sheng, GF.(2005).Crystal structure of natural non-metamict Ti- and Fe2+-rich chevkinite-(Ce).ACTA GEOLOGICA SINICA-ENGLISH EDITION,79(3),325. |
| MLA | Li, GW,et al."Crystal structure of natural non-metamict Ti- and Fe2+-rich chevkinite-(Ce)".ACTA GEOLOGICA SINICA-ENGLISH EDITION 79.3(2005):325. |
入库方式： OAI收割
来源：物理研究所
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