Structural and Electrical Properties of Novel Cr/Fe Mixed Transition-Metal Phosphates
- Zaineb MighriZaineb MighriLaboratory of Physical Chemistry of Materials (LR01ES19), Faculty of Sciences of Monastir, University of Monastir, Avenue de l’Environnement, 5019 Monastir, TunisiaMore by Zaineb Mighri
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- Khalifa SouiwaKhalifa SouiwaLaboratory of Physical Chemistry of Materials (LR01ES19), Faculty of Sciences of Monastir, University of Monastir, Avenue de l’Environnement, 5019 Monastir, TunisiaMore by Khalifa Souiwa
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- Arpad Mihai RostasArpad Mihai RostasNational Institute for Research and Development of Isotopic and Molecular Technologies, Donat 67−103, 400293 Cluj-Napoca, RomaniaNational Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Magurele, RomaniaMore by Arpad Mihai Rostas
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- Roxana Elena PatruRoxana Elena PatruNational Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Magurele, RomaniaMore by Roxana Elena Patru
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- Amelia Elena BocirneaAmelia Elena BocirneaNational Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Magurele, RomaniaMore by Amelia Elena Bocirnea
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- Nicusor IacobNicusor IacobNational Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Magurele, RomaniaMore by Nicusor Iacob
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- Victor KuncserVictor KuncserNational Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Magurele, RomaniaMore by Victor Kuncser
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- Outman El KhoujaOutman El KhoujaNational Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Magurele, RomaniaMore by Outman El Khouja
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- Lucia Nicoleta LeonatLucia Nicoleta LeonatNational Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Magurele, RomaniaMore by Lucia Nicoleta Leonat
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- Mourad HidouriMourad HidouriLaboratory of Physical Chemistry of Materials (LR01ES19), Faculty of Sciences of Monastir, University of Monastir, Avenue de l’Environnement, 5019 Monastir, TunisiaNational School of Engineers of Gafsa, 2112 Gafsa, TunisiaMore by Mourad Hidouri
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- Habib Nasri*Habib Nasri*Email: [email protected]Laboratory of Physical Chemistry of Materials (LR01ES19), Faculty of Sciences of Monastir, University of Monastir, Avenue de l’Environnement, 5019 Monastir, TunisiaMore by Habib Nasri
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- Aurelian Catalin Galca*Aurelian Catalin Galca*Email: [email protected]National Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Magurele, RomaniaMore by Aurelian Catalin Galca
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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