| Transmission electron microscopic study of new, regular, mixed-layer structures in calcium-rare-earth fluorocarbonate minerals | |
| X. L. Wu; D. W. Meng; Z. L. Pan; G. M. Yang; D. X. Li | |
| 1998 | |
| Source Publication | Mineralogical Magazine
 |
| ISSN | 0026-461X |
| Volume | 62Issue:1Pages:55-64 |
| Abstract | Structures of calcium-rare-earth (Ca-RE) fluorocarbonate minerals from southwest China have been investigated using selected area electron diffraction (SAED) and high-resolution transmission electron microscopy (HRTEM). They are described as combinations of layers of bastnasite-(Ce), CeFCO3 (B layers), and synchysite-(Ce), CeFCO3-CaCO3 (S layers) (Donnay and Donnay, 1953). We report here the discovery of six new, regular, mixed-layer structures in parisite-(Ce) observed using SAED and HRTEM. The symmetry, cell parameters, chemical formulae and stacking of the structural unit layers, etc., were determined for each. The regular, mixed-layer structures are formed by stacking unit layers of bastnasite-(Ce) and synchysite-(Ce) in varying proportions along the c axis. HRTEM shows that there are different distribution modes for the Ce-F ion layers, the CO3 inn groups between the Ce-F ion layers and the CO3 ion groups between the Ce-F and Ca ion layers. The minerals may be regarded as polymorphs with the same chemical composition and the same spacing of the unit layers, but different arrangements of ion layers in the structural unit layers and different stacking sequences of the structural unit layers. |
| description.department | china univ geosci, dept phys, wuhan 430074, peoples r china. acad sinica, inst met res, atom imaging solids lab, shenyang 110015, peoples r china.;wu, xl (reprint author), china univ geosci, dept phys, wuhan 430074, peoples r china |
| Keyword | Ca-re Fluorocarbonate Mineral Mixed-layer Structure High-resolution Transmission Electron Microscopy |
| URL | 查看原文 |
| WOS ID | WOS:000072377900005 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/37824 |
| Collection | 中国科学院金属研究所 |
| Recommended Citation GB/T 7714 | X. L. Wu,D. W. Meng,Z. L. Pan,et al. Transmission electron microscopic study of new, regular, mixed-layer structures in calcium-rare-earth fluorocarbonate minerals[J]. Mineralogical Magazine,1998,62(1):55-64. |
| APA | X. L. Wu,D. W. Meng,Z. L. Pan,G. M. Yang,&D. X. Li.(1998).Transmission electron microscopic study of new, regular, mixed-layer structures in calcium-rare-earth fluorocarbonate minerals.Mineralogical Magazine,62(1),55-64. |
| MLA | X. L. Wu,et al."Transmission electron microscopic study of new, regular, mixed-layer structures in calcium-rare-earth fluorocarbonate minerals".Mineralogical Magazine 62.1(1998):55-64. |
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