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Determination of six new polytypes in parisite-(Ce) by means of high resolution electron microscopy

Published online by Cambridge University Press:  05 July 2018

Meng Dawei ,
Wu Xiuling ,
Mou Tao  and
Li Douxing
Meng Dawei*
Affiliation:
Test Center, China University of Geosciences, Wuhan, 430074, P.R. China
Wu Xiuling
Affiliation:
Test Center, China University of Geosciences, Wuhan, 430074, P.R. China
Mou Tao
Affiliation:
Test Center, China University of Geosciences, Wuhan, 430074, P.R. China
Li Douxing
Affiliation:
Laboratory of Atomic Imaging of Solids, Institute of Metal Research, Academia Sinica, Shenyang, 110015, P.R. China
*
*E-mail: dwmeng@cug.edu.cn
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Abstract

The ultrastructures of parisite-(Ce) from a rare-earth mineral deposit of Sichuan Province, southwest China, have been observed and investigated by selected area electron diffraction (SAED) and high resolution electron microscopy (HREM). Six new polytypes 4H, 10H, 16H, 18R, 24R and 30R were determined in parisite-(Ce), as were their crystal structure types, subcell (a′c‴, a′c″, a′c′) and supercell (ac) parameters, reflection conditions, polytype features and probable space groups. The HREM studies revealed the complex polytypism in parisite-(Ce) whereby the six new polytypes, formed by long-period ordered stacking, always coexist with the common polytype parisite-(Ce)-6R by syntaxy and thus constitute the complex microstructural ‘syntactic polycrystals’, the host of which is the polytype parisite-(Ce)-6R.

Keywords

parisitepolytypehigh-resolution electron microscopy
Type
Research Article
Information
Mineralogical Magazine , Volume 65 , Issue 6 , December 2001 , pp. 797 - 806
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2001

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References

Donnay, G. (1953) Roentgenite-(Ce). A new mineral from Greenland. Amer. Mineral., 38, 868–70.Google Scholar
Donnay, G. and Donnay, J.D.H. (1953) The crystallography of bastnaesite-(Ce), parisite-(Ce), roentgenite-(Ce) and synchysite-(Ce). Amer. Mineral., 38, 932–63.Google Scholar
Ni, Y.X., Hughes, J.M. and Mariano, A.N. (1993) The atomic arrangement of bastnaestite-(Ce), Ce (CO3)F, and structural elements of synchysite-(Ce) and parisite-(Ce). Amer. Mineral., 78, 415–8.Google Scholar
Van Landuyt, J. and Amelinckx, S. (1975) Multiple beam direct lattice imaging of a new mixed-layer compound of the bastnaesite- synchysite series. Amer. Mineral., 60, 351–8.Google Scholar
Wu, X., Meng, D., Pan, Z., Yang, G. and Li, D. (1998) Transmission electron microscopic study of new, regular mixed-layer structures in calcium-rare-earth fluorocarbonate minerals. Mineral. Mag., 62, 55–64.Google Scholar