Synthesis,Crystal Structure,and Characterization of Na7Cu4(AsO4)5 |
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| Authors: | Fathia Rajah Mohsen Graia Tahar Mhiri |
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| Affiliation: | 1. Laboratoire de L’Etat Solide, Faculté des Sciences de Sfax , Université de Sfax , Tunisia;2. Laboratoire de Matériaux et de Cristallochimie, Faculté des Sciences de Tunis , Université de Tunis-El Manar , Tunisia |
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| Abstract: | Abstract Sodium copper (II) arsenate Na7Cu4(AsO4)5 has been grown by conventional high-temperature, solid-state methods in molten-salt media. It was characterized by single crystal X-ray diffraction (XRD), thermal analysis (DTA–TGA), scanning electron microscopy (SEM), semiquantitative energy dispersive spectroscopy analysis (EDS), and vibrational spectroscopy. Na7Cu4(AsO4)5 exhibits a three-dimensional framework built up of CuO5, CuO4, and AsO4 polyhedra, with intersecting channels in which the Na+ cations are located. The three-dimensional cohesion of the framework results from Cu–O–As bridges. CuO5 and CuO4 polyhedra are elongated due to the Jahn–Teller effect, whereas AsO4 tetrahedra are almost regular. This new structural model is validated by the charge distribution (CD) analysis. The infrared and Raman spectra confirmed the presence of AsO4 tetrahedra. [Supplementary materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfer, and Silicon and the Related Elements for the following free supplemental files: Additional tables and figures.] |
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| Keywords: | Crystal structure vibrational spectroscopy DTA-TGA charge distribution (CD) bond valence (BV) |
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