HRTEM study of three new regularly mixed-layer structures of B8S6 type in Ca-RE fluorocarbonate minerals

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	HRTEM study of three new regularly mixed-layer structures of B8S6 type in Ca-RE fluorocarbonate minerals
	D. W. Meng; X. L. Wu; Z. L. Pan; G. M. Yang; D. X. Li
	1997
发表期刊	Journal of Rare Earths
ISSN	1002-0721
卷号	15 期号:1 页码:38-44
摘要	The mitrostructural features of clacium-rare earth(Ca-RE) fluorocarbonate minerals from Southwest China were studied by using selected area electron diffraction (SAED) and high resolution transmission electron microscopy (HRTEM). Three new regularly mixed-layer structures of B8S6 type with long period and different stacking sequence, i.e. B8S6-I, B8S6-II, and B8S6-III, were found in the derived polycrystal of parisite, in which their structural symmetry, cell parameters, chemical formulas of crystal and stacking models of structural unit layer, etc. were determined. The results of this study also show that these new regularly mixed-layer structures were formed by order stacking unit layer of bastnaesite(B) and synchisite(S) in varying proportion along c axis. The observation under HRTEM reveals that in the three new regularly mixed-layer structures there are different distribution modes of Ce-F ion layers, CO32- ion groups between the Ce-F ion layers, and CO32- ion groups between Ce-F and Ca2+ ion layers, and there are some heterogeneous textures, such as disorder interlayer and stacking fault. It further proves the complexity of the crystal structure of the Ca-RE fluorocarbonate minerals.
部门归属	china univ geosci,dept mat sci & engn,dept phys,ctr measurement & test,wuhan 430074,peoples r china. acad sinica,inst met res,atom imaging solids lab,shenyang 110015,peoples r china.
关键词	Rare Earths Ca-re Fluorocarbonate Mineral Mixed-layer Structure High-resolution Transmission Electron Microscopy
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/38051
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	D. W. Meng,X. L. Wu,Z. L. Pan,et al. HRTEM study of three new regularly mixed-layer structures of B8S6 type in Ca-RE fluorocarbonate minerals[J]. Journal of Rare Earths,1997,15(1):38-44.
APA	D. W. Meng,X. L. Wu,Z. L. Pan,G. M. Yang,&D. X. Li.(1997).HRTEM study of three new regularly mixed-layer structures of B8S6 type in Ca-RE fluorocarbonate minerals.Journal of Rare Earths,15(1),38-44.
MLA	D. W. Meng,et al."HRTEM study of three new regularly mixed-layer structures of B8S6 type in Ca-RE fluorocarbonate minerals".Journal of Rare Earths 15.1(1997):38-44.