Transmission electron microscopic study of new, regular, mixed-layer structures in calcium-rare-earth fluorocarbonate minerals

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	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
发表期刊	Mineralogical Magazine
ISSN	0026-461X
卷号	62 期号:1 页码:55-64
摘要	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.
部门归属	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
关键词	Ca-re Fluorocarbonate Mineral Mixed-layer Structure High-resolution Transmission Electron Microscopy
URL	查看原文
WOS记录号	WOS:000072377900005
引用统计	被引频次：22[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/37824
专题	中国科学院金属研究所
推荐引用方式 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.