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  Scopus ID: 21100926589

Synthesis and Crystal Structure of a New Phosphate Na1.37Co1.36Cr1.64(PO4)3 with the α-CrPO4 Structure

Sirine El Arni, Mohammed Hadouchi, Jamal Khmiyas, Abderrazzak Assani, Mohamed Saadi and Lahcen El Ammari

Abstract

Phosphate materials have attracted a growing interest for their promising applications such as catalysts and electrode materials. In the context of the elaboration and structural study of novel phosphates, we present in this work a new phosphate, Na1.37Co1.36Cr1.64(PO4)3, belonging to the well-established structure type, α-CrPO4. This phosphate was produced via a solid-state process and its structure was deduced from single-crystal diffraction data. The Na1.37Co1.36Cr1.64(-PO4)3 crystallizes in orthorhombic symmetry, with the Imma space group and unit cell parameters: a = 10.4148(1) Å, b = 13.1091(2) Å, c = 6.4403(1) Å, and V = 879.29 (2) Å3. The framework is made up of PO4 tetrahedra, (Cr1/Co1)O6 octahedra and (Co2/Cr2)2 O10 dimers octahedra. The structure of the title compound can be described as an assembly of two building units: (1) sheets parallel to the (b,c) plane, consisting of the corner and edges sharing (Co2/Cr2)2 O10 dimers and P(2)O4 tetrahedra, (2) chains made from corner-sharing (Cr1/Co1)O6 octahedra and P(1)O4 tetrahedra running along the b-axis. The association of these building units gives rise to a 3D (Three-dimensional) architecture with two distinct kinds of tunnels parallel to the a and b directions where the Na+ ions are situated. The Na atoms are both surrounded by eight oxygens.

Published on: September 29, 2023
doi: 10.17756/nwj.2023-s2-076
Citation: El Arni S, Hadouchi M, Khmiyas J, Assani A, Saadi M, et al. 2023. Synthesis and Crystal Structure of a New Phosphate Na1.37Co1.36Cr1.64(PO4)3 with the α-CrPO4 Structure. NanoWorld J 9(S2): S449-S454.

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