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Mighri Z, Souiwa K, Rostas AM, Patru RE, Bocirnea AE, Iacob N, Kuncser V, El Khouja O, Leonat LN, Hidouri M, Nasri H, Galca AC. Structural and Electrical Properties of Novel Cr/Fe Mixed Transition-Metal Phosphates. Inorg Chem 2023. [PMID: 37224441 DOI: 10.1021/acs.inorgchem.2c04389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The phosphate KCoCr(PO4)2 and iron-substituted variants KCoCr1-xFex(PO4)2 (x = 0.25, 0.5, and 0.75) were synthesized by a solid-state reaction route, while a high substitution level of Fe was achieved. Their structures were refined using powder X-ray diffraction and indexed in a monoclinic system with a P21/n space group. A 3D framework with six-sided tunnels parallel to the [101] direction was formed in which the K atoms are located. Mössbauer spectroscopy confirms the exclusive presence of octahedral paramagnetic Fe3+ ions, with isomer shifts increasing slightly with x substitution. Electron paramagnetic resonance spectroscopy confirmed the presence of paramagnetic Cr3+ ions. The activation energy, determined by dielectric measurements, shows that the iron-containing samples present higher ionic activity. Relative to the electrochemical activity of K, these materials could be good candidates for positive and/or negative electrode materials for energy storage applications.
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Affiliation(s)
- Zaineb Mighri
- Laboratory of Physical Chemistry of Materials (LR01ES19), Faculty of Sciences of Monastir, University of Monastir, Avenue de l'Environnement, 5019 Monastir, Tunisia
| | - Khalifa Souiwa
- Laboratory of Physical Chemistry of Materials (LR01ES19), Faculty of Sciences of Monastir, University of Monastir, Avenue de l'Environnement, 5019 Monastir, Tunisia
| | - Arpad Mihai Rostas
- National Institute for Research and Development of Isotopic and Molecular Technologies, Donat 67-103, 400293 Cluj-Napoca, Romania
- National Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Magurele, Romania
| | - Roxana Elena Patru
- National Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Magurele, Romania
| | - Amelia Elena Bocirnea
- National Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Magurele, Romania
| | - Nicusor Iacob
- National Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Magurele, Romania
| | - Victor Kuncser
- National Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Magurele, Romania
| | - Outman El Khouja
- National Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Magurele, Romania
| | - Lucia Nicoleta Leonat
- National Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Magurele, Romania
| | - Mourad Hidouri
- Laboratory of Physical Chemistry of Materials (LR01ES19), Faculty of Sciences of Monastir, University of Monastir, Avenue de l'Environnement, 5019 Monastir, Tunisia
- National School of Engineers of Gafsa, 2112 Gafsa, Tunisia
| | - Habib Nasri
- Laboratory of Physical Chemistry of Materials (LR01ES19), Faculty of Sciences of Monastir, University of Monastir, Avenue de l'Environnement, 5019 Monastir, Tunisia
| | - Aurelian Catalin Galca
- National Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Magurele, Romania
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