Lamellar crystal structure of the trigonal mixed-metal phosphate RbCoFe(PO4)2
- 1Laboratoire de Chimie Appliquée des Matériaux Centre des Sciences des Matériaux Faculty of Science Mohammed V University in Rabat Avenue Ibn Batouta BP 1014 Rabat Morocco
- 2Laboratoire de Chimie des Matériaux Inorganiques Faculté des Sciences Département de Chimie Université des Sciences et Techniques de Masuku, BP 943 Franceville Gabon
Abstract
The title compound, rubidium cobalt iron bis(phosphate), was synthesized by the solid-state method under atmospheric conditions. This phosphate crystallizes with trigonal symmetry in space group P3m1 and all atoms lie on special crystallographic positions. In this structure, the CoIIO4 tetrahedra alternate with one of the two types of PO4 tetrahedra, sharing the vertices of their bases and extending along the a- and b-axis directions to form a first tetrahedral layer, lying parallel to the (001) plane. The same alternation is observed between the FeIIIO4 tetrahedra and the other PO4 tetrahedra, leading to the formation of a second layer also lying parallel to the (001) plane. In the first layer, all tetrahedra are oriented downwards, while in the second, they are oriented upwards with respect to the c axis. The interconnection between these two layers is ensured by the sharing of the vertices of the CoO4 and PO4 tetrahedra, as well as the vertex of the FeO4 tetrahedra, with those of the other PO4 tetrahedra. The stacking of these two layers leads to the formation of [CoFeP2O8]−∞ double layers lying parallel to the (001) plane and creates hexagonal tunnels running parallel to the c-axis direction. The Rb+ cations are located at the intersection of the tunnels with the interlayer space, thus forming a plane lying perpendicular to the c-axis direction, sandwiched between the double layers. In this structure, each rubidium atom exhibits a coordination number of twelve, whereas in the similar structure of KMgFe(PO4)2, which has monoclinic symmetry, the potassium cation is surrounded by eight oxygen atoms.
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BibTeX
@article{bouraima2026lamellar,
title = {{Lamellar crystal structure of the trigonal mixed-metal phosphate RbCoFe(PO4)2}},
author = {Adam Bouraima and Said Ouaatta and Jamal Khmiyas and Jean jacques Anguilè and Thomas Makani and Abderrazzak Assani and Mohamed Saadi and Lahcen El Ammari},
journal = {Acta Crystallographica Section E: Crystallographic Communications},
year = {2026},
month = oct,
doi = {10.1107/s2056989026007632},
url = {https://doi.org/10.1107/s2056989026007632},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Lamellar crystal structure of the trigonal mixed-metal phosphate RbCoFe(PO4)2
AU - Adam Bouraima
AU - Said Ouaatta
AU - Jamal Khmiyas
AU - Jean jacques Anguilè
AU - Thomas Makani
AU - Abderrazzak Assani
AU - Mohamed Saadi
AU - Lahcen El Ammari
PY - 2026
DA - 2026/10/02
JO - Acta Crystallographica Section E: Crystallographic Communications
DO - 10.1107/s2056989026007632
UR - https://doi.org/10.1107/s2056989026007632
AB - The title compound, rubidium cobalt iron bis(phosphate), was synthesized by the solid-state method under atmospheric conditions. This phosphate crystallizes with trigonal symmetry in space group P3m1 and all atoms lie on special crystallographic positions. In this structure, the CoIIO4 tetrahedra alternate with one of the two types of PO4 tetrahedra, sharing the vertices of their bases and extending along the a- and b-axis directions to form a first tetrahedral layer, lying parallel to the (001) plane. The same alternation is observed between the FeIIIO4 tetrahedra and the other PO4 tetrahedra, leading to the formation of a second layer also lying parallel to the (001) plane. In the first layer, all tetrahedra are oriented downwards, while in the second, they are oriented upwards with respect to the c axis. The interconnection between these two layers is ensured by the sharing of the vertices of the CoO4 and PO4 tetrahedra, as well as the vertex of the FeO4 tetrahedra, with those of the other PO4 tetrahedra. The stacking of these two layers leads to the formation of [CoFeP2O8]−∞ double layers lying parallel to the (001) plane and creates hexagonal tunnels running parallel to the c-axis direction. The Rb+ cations are located at the intersection of the tunnels with the interlayer space, thus forming a plane lying perpendicular to the c-axis direction, sandwiched between the double layers. In this structure, each rubidium atom exhibits a coordination number of twelve, whereas in the similar structure of KMgFe(PO4)2, which has monoclinic symmetry, the potassium cation is surrounded by eight oxygen atoms.
SN - 2056-9890
ER -