Structural distortion and disorder in pseudo-trigonal noncentrosymmetric K4Ce(CO3)(3)O.2H(2)O

Citation
S. Yonezawa et al., Structural distortion and disorder in pseudo-trigonal noncentrosymmetric K4Ce(CO3)(3)O.2H(2)O, J PHYS CH S, 62(8), 2001, pp. 1507-1512
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
ISSN journal
0022-3697 → ACNP
Volume
62
Issue
8
Year of publication
2001
Pages
1507 - 1512
Database
ISI
SICI code
0022-3697(200107)62:8<1507:SDADIP>2.0.ZU;2-Q
Abstract
The crystallisation of a new rare earth carbonate K4Ce(CO3)(3)O.2H(2)O is o bserved at the interface between a solution of K2CO3 and a CeF3 nutrient po wder at 180 degreesC. The structure is determined from X-ray crystal diffra ction data. The cell is orthorhombic (Amm2 space group, a(O) = 4.1741(5), b (O) = 16.305(2), c(O) = 9.395(1) Angstrom, Z= 2) and derives from a trigona l cell (a(H) approximate to 9.40 and c(H) = 4.174 Angstrom). The Ce4+ ions adopt an eight-fold coordination with six oxygen atoms from three carbonate groups in a mean plane; the last two oxygen atoms link the CeO8 polyhedra in order to build infinite chains along the a axis. (C) 2001 Elsevier Scien ce Ltd. Ah rights reserved.