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  Scopus ID: 21100926589

A Novel Non-stoichiometric Phosphate Ba0.94Co0.81Cr1.84(PO4)3 with the α-CrPO4 Structure: Synthesis and Crystal Structure

Fouad Alloun, Siham El Maataoui, Mohammed Hadouchi, Jamal Khmiyas, Abderrazzak Assani, Mohamed Saadi and Lahcen El Ammari

Abstract

Due to their interesting structural flexibility, affordable synthesis, and various properties, scientists have recently focused on developing novel phosphates containing transition metals with numerous promising structures. Using a typical solid-state reaction, a new phosphate Ba0.94Co0.81Cr1.84(PO4)3, is elaborated as a single crystal, and its structure is determined by X-ray diffraction technique. It crystallizes in the orthorhombic system with the Imma space group and the unit cell parameters a = 10.4773 (4) Å, b = 13.1814 (5) Å, and c = 6.6117 (2) Å. The structure of this novel compound is characterized by partially occupied sites situated on the special positions 4e, 4a, and 8g. The crystal framework is constructed from isolated polyhedra CoO6, PO4, and Cr2O10 dimers resulting from edge-sharing CrO6 octahedra. The linkage between Cr2O10 units and PO4 tetrahedra via common corners and edges results in a sheet parallel to the (b,c) plane. Alternating PO4 tetrahedra and CoO6 octahedra form linear chains running along the b-axis. The interconnection of the sheets and chains forms the crystal framework, exhibiting two types of intersecting tunnels containing Ba2+ ions.

Published on: September 29, 2023
doi: 10.17756/nwj.2023-s2-075
Citation: Alloun F, El Maataoui S, Hadouchi M, Khmiyas J, Assani A, et al. 2023. A Novel Non-stoichiometric Phosphate Ba0.94Co0.81Cr1.84(PO4)3 with the α-CrPO4 Structure: Synthesis and Crystal Structure. NanoWorld J 9(S2): S444-S448.

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