MATEC Web Conf.
Volume 149, 20182nd International Congress on Materials & Structural Stability (CMSS-2017)
|Number of page(s)||7|
|Section||Session 1 : Materials & Pathologies|
|Published online||14 February 2018|
Synthesis and structural characterization of new cadmium, zinc and iron based pyrophosphate: (Cd,Zn)25Fe(P2O7)2
Laboratoire de Chimie Appliquée des Matériaux, Centre des Sciences des Matériaux, Faculty of Sciences, Mohammed V University in Rabat, Avenue Ibn Battouta, BP 1014, Rabat, Morocco.
The novel compound with the following nominal formulation (Cd, Zn)2.5Fe(P2O7)2 has been successfully prepared by the solid state reaction and characterized by single-crystal X-ray diffraction. This phosphate crystallizes in the orthorhombic system with the C2221 space group. Its crystal structure is formed by five types of cationic sites and by two unique (P2O7)4- anionic groups with a staggered conformation. In the structure, three sites are fulfilled by Zn2+ :(Zn(3), Zn(4)) and Fe(1)3+, the fourth site is localized in the Wyckoff position 4a (site symmetry 2 ‥) and is statically occupied by Cd2+ : Zn2+with ratio 0.586(2) : 0.413(8). The last site, localized in 8c Wyckoff position (site symmetry 1) is also occupied by a mixture of the two cations Cd2+ : Zn2+with occupancies of 0.444(6) : 0.555(4).Within this framework, the metallic polyhedra [MOn] (n = 5 or 6) form corrugated layers stacked along the b-axis, and intercalated by P2O7 groups.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).
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