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Šimko F, Rakhmatullin A, King G, Allix M, Bessada C, Netriová Z, Krishnan D, Korenko M. Cesium Oxo-fluoro-aluminates in the CsF-Al 2O 3 System: Synthesis and Structural Characterization. Inorg Chem 2023; 62:15651-15663. [PMID: 37698893 DOI: 10.1021/acs.inorgchem.3c02386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/13/2023]
Abstract
In an experiment combining various approaches, a precise examination of a portion of the phase diagram of a CsF-Al2O3 system was carried out up to 40 mol% Al2O3. CsF-Al2O3 solidified mixtures have been investigated using high-field solid-state NMR (133Cs, 27Al, and 19F) spectroscopy and X-ray powder diffraction over a broad range of compositions with synchrotron powder diffraction and Rietveld analysis. A new cesium oxo-fluoro-aluminate, Cs2Al2O3F2, was discovered, prepared, and structurally analyzed by synchrotron diffraction analysis. In addition to Cs2Al2O3F2, we have synthesized the following pure compounds in order to aid in the interpretation of NMR spectra of the solidified samples: CsAlF4, Cs3AlF6, and CsAlO2.
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Affiliation(s)
- František Šimko
- Institute of Inorganic Chemistry, Slovak Academy of Sciences, 845 36 Bratislava, Slovakia
- Centre of Excellence for Advanced Materials Application - CEMEA, Slovak Academy of Sciences, Dúbravská cesta 5807/9, 845 11 Bratislava, Slovakia
| | - Aydar Rakhmatullin
- Conditions Extrêmes ét Matériaux: Haute Température et Irradiation, CEMHTI, UPR 3079 -CNRS Univ. Orléans 450 71, Orléans, France
| | - Graham King
- Material and Chemical Sciences, Canadian Light Source, Saskatoon, Saskatchewan S7N 2V3, Canada
| | - Mathieu Allix
- Conditions Extrêmes ét Matériaux: Haute Température et Irradiation, CEMHTI, UPR 3079 -CNRS Univ. Orléans 450 71, Orléans, France
| | - Catherine Bessada
- Conditions Extrêmes ét Matériaux: Haute Température et Irradiation, CEMHTI, UPR 3079 -CNRS Univ. Orléans 450 71, Orléans, France
| | - Zuzana Netriová
- Institute of Inorganic Chemistry, Slovak Academy of Sciences, 845 36 Bratislava, Slovakia
| | - Dhiya Krishnan
- Institute of Inorganic Chemistry, Slovak Academy of Sciences, 845 36 Bratislava, Slovakia
| | - Michal Korenko
- Institute of Inorganic Chemistry, Slovak Academy of Sciences, 845 36 Bratislava, Slovakia
- Material and Chemical Sciences, Canadian Light Source, Saskatoon, Saskatchewan S7N 2V3, Canada
- Loire Valley Institute for Advanced Studies, 1 Rue Dupanloup, 45000 Orléans, France
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Fernández-Carrión AJ, Rakhmatullin A, Yang L, Pitcher MJ, Massiot D, Porcher F, Allix M, Kuang X. Sodium Site Exchange and Migration in a Polar Stuffed-Cristobalite Framework Structure. Inorg Chem 2021; 60:4322-4331. [PMID: 33719424 DOI: 10.1021/acs.inorgchem.1c00319] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The study of ionic dynamics in solids is essential to understanding and developing modern energy technologies. Here we study the ionic dynamics of orthorhombic Na2MgSiO4, an interesting case of a polar stuffed-cristobalite-type structure that contains two inequivalent Na sites within the channels of the magnesium silicate tetrahedral framework. Its preparation by a solid-state reaction method favors the presence of ∼2% of Na vacancies, converting it into a pure Na ionic conductor with an optimized ionic conductivity of ∼10-5 S cm-1 at 200 °C. The macroscopic migration has been characterized through impedance spectroscopy and molecular dynamics simulation, which proves the pure Na ionic character of the compound through hopping between Na1 and Na2 sites, forming three-dimensional migration zigzag-shaped paths. High-resolution solid-state 23Na magic-angle-spinning (MAS) NMR spectroscopy is employed to characterize the local structure and microscopic dynamics of Na-ion transport in Na2MgSiO4. Remarkably, variable-temperature 23Na MAS NMR and two-dimensional exchange spectroscopy evidence for the first time a Na site exchange phenomenon at room temperature, which further triggers Na ionic conduction at elevated temperatures.
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Affiliation(s)
- Alberto J Fernández-Carrión
- MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
| | | | - Li Yang
- MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
| | | | | | - Florence Porcher
- Laboratoire Léon Brillouin, CEA Saclay, Gif Sur Yvette 91191, France
| | - Mathieu Allix
- CNRS, CEMHTI, UPR 3079, Université Orléans, Orléans F-45071, France
| | - Xiaojun Kuang
- MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China.,College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, P. R. China
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3
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Rakhmatullin A, Šimko F, Véron E, Allix M, Martineau-Corcos C, Fitch A, Fayon F, Shakhovoy RA, Okhotnikov K, Sarou-Kanian V, Korenko M, Netriová Z, Polovov IB, Bessada C. X-ray Diffraction, NMR Studies, and DFT Calculations of the Room and High Temperature Structures of Rubidium Cryolite, Rb 3AlF 6. Inorg Chem 2020; 59:6308-6318. [PMID: 32286067 DOI: 10.1021/acs.inorgchem.0c00415] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A crystallographic approach incorporating multinuclear high field solid state NMR (SSNMR), X-ray structure determinations, TEM observation, and density functional theory (DFT) was used to characterize two polymorphs of rubidium cryolite, Rb3AlF6. The room temperature phase was found to be ordered and crystallizes in the Fddd (no. 70) space group with a = 37.26491(1) Å, b = 12.45405(4) Å, and c = 17.68341(6) Å. Comparison of NMR measurements and computational results revealed the dynamic rotations of the AlF6 octahedra. Using in situ variable temperature MAS NMR measurements, the chemical exchange between rubidium sites was observed. The β-phase, i.e., high temperature polymorph, adopts the ideal cubic double-perovskite structure, space group Fm3m, with a = 8.9930(2) Å at 600 °C. Additionally, a series of polymorphs of K3AlF6 has been further characterized by high field high temperature SSNMR and DFT computation.
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Affiliation(s)
- Aydar Rakhmatullin
- Conditions Extrêmes ét Matériaux: Haute Température et Irradiation, CEMHTI, UPR 3079-CNRS Université Orléans, 45071, Orléans, France
| | - František Šimko
- Institute of Inorganic Chemistry, Slovak Academy of Sciences, 845 36 Bratislava, Slovakia.,Centre of Excellence for advanced Materials Application - CEMEA, Slovak Academy of Sciences, Dúbravská cesta 5807/9, 845 11 Bratislava, Slovakia
| | - Emmanuel Véron
- Conditions Extrêmes ét Matériaux: Haute Température et Irradiation, CEMHTI, UPR 3079-CNRS Université Orléans, 45071, Orléans, France
| | - Mathieu Allix
- Conditions Extrêmes ét Matériaux: Haute Température et Irradiation, CEMHTI, UPR 3079-CNRS Université Orléans, 45071, Orléans, France
| | - Charlotte Martineau-Corcos
- Conditions Extrêmes ét Matériaux: Haute Température et Irradiation, CEMHTI, UPR 3079-CNRS Université Orléans, 45071, Orléans, France.,Université de Versailles Saint-Quentin en Yvelines, 45 Avenue des Etats-Unis, 78035 Versailles Cedex, France
| | | | - Franck Fayon
- Conditions Extrêmes ét Matériaux: Haute Température et Irradiation, CEMHTI, UPR 3079-CNRS Université Orléans, 45071, Orléans, France
| | - Roman A Shakhovoy
- Conditions Extrêmes ét Matériaux: Haute Température et Irradiation, CEMHTI, UPR 3079-CNRS Université Orléans, 45071, Orléans, France
| | - Kirill Okhotnikov
- Conditions Extrêmes ét Matériaux: Haute Température et Irradiation, CEMHTI, UPR 3079-CNRS Université Orléans, 45071, Orléans, France
| | - Vincent Sarou-Kanian
- Conditions Extrêmes ét Matériaux: Haute Température et Irradiation, CEMHTI, UPR 3079-CNRS Université Orléans, 45071, Orléans, France
| | - Michal Korenko
- Institute of Inorganic Chemistry, Slovak Academy of Sciences, 845 36 Bratislava, Slovakia.,Centre of Excellence for advanced Materials Application - CEMEA, Slovak Academy of Sciences, Dúbravská cesta 5807/9, 845 11 Bratislava, Slovakia
| | - Zuzana Netriová
- Institute of Inorganic Chemistry, Slovak Academy of Sciences, 845 36 Bratislava, Slovakia
| | - Ilja B Polovov
- Department of Rare Metals and Nanomaterials, Institute of Physics and Technology Ural Federal University, Ekaterinburg, Russia
| | - Catherine Bessada
- Conditions Extrêmes ét Matériaux: Haute Température et Irradiation, CEMHTI, UPR 3079-CNRS Université Orléans, 45071, Orléans, France
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Šimko F, Rakhmatullin A, Véron E, Allix M, Florian P, Kontrík M, Netriová Z, Korenko M, Kavečanský V, Bessada C. Oxo- and Oxofluoroaluminates in the RbF-Al 2O 3 System: Synthesis and Structural Characterization. Inorg Chem 2018; 57:13702-13712. [PMID: 30353736 DOI: 10.1021/acs.inorgchem.8b02275] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Precise research on the RbF-Al2O3 system was carried out by means of combining X-ray powder diffraction, high-field solid-state NMR spectroscopy, and thermal analysis methods. α-Rb3AlF6, RbAlO2, Rb2Al22O34, and new phase, Rb2Al2O3F2, were identified in the system. The structure of this new rubidium oxofluoroaluminate was determined. It is built up from single layers of oxygen-connected AlO3F tetrahedra, those layers beeing separated by fluorine atoms. This type of structure exhibits a decent ionic conductivity at ambient temperature, 1.74 × 10-6 S cm-1. The similar structural arrangement of O3Al-O-AlO3 and FO2Al-O-AlO2F tetrahedra of the conduction planes in Rb2Al22O34 and Rb2Al2O3F2 were confirmed by 27Al NMR measurements. A thermal analysis of the RbF-Al2O3 system revealed that it can be defined as a pseudobinary subsystem of the more general quaternary RbF-AlF3-Al2O3-Rb2O phase diagram. From a phase analysis of individual phase fields, the mutual metastable behavior of all founded phases can be considered. It was observed that fluoro- and oxoaluminates exist together. Rb2Al2O3F2 is more stable under high temperature. Rubidium fluoro- and oxoaluminates are metastable precursors of the thermodynamically more stable structure of rubidium oxofluoroaluminate.
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Affiliation(s)
- František Šimko
- Institute of Inorganic Chemistry , Slovak Academy of Sciences , 845 36 Bratislava , Slovakia
| | - Aydar Rakhmatullin
- Conditions Extrêmes ét Matériaux: Haute Température et Irradiation, CEMHTI , UPR 3079-CNRS Univ. Orléans , 450 71 , Orléans , France
| | - Emmanuel Véron
- Conditions Extrêmes ét Matériaux: Haute Température et Irradiation, CEMHTI , UPR 3079-CNRS Univ. Orléans , 450 71 , Orléans , France
| | - Mathieu Allix
- Conditions Extrêmes ét Matériaux: Haute Température et Irradiation, CEMHTI , UPR 3079-CNRS Univ. Orléans , 450 71 , Orléans , France
| | - Pierre Florian
- Conditions Extrêmes ét Matériaux: Haute Température et Irradiation, CEMHTI , UPR 3079-CNRS Univ. Orléans , 450 71 , Orléans , France
| | - Martin Kontrík
- Institute of Inorganic Chemistry , Slovak Academy of Sciences , 845 36 Bratislava , Slovakia
| | - Zuzana Netriová
- Institute of Inorganic Chemistry , Slovak Academy of Sciences , 845 36 Bratislava , Slovakia
| | - Michal Korenko
- Institute of Inorganic Chemistry , Slovak Academy of Sciences , 845 36 Bratislava , Slovakia
| | - Viktor Kavečanský
- Institute of Experimental Physics SAS , Watsonova 47 , 040 01 Košice , Slovakia
| | - Catherine Bessada
- Conditions Extrêmes ét Matériaux: Haute Température et Irradiation, CEMHTI , UPR 3079-CNRS Univ. Orléans , 450 71 , Orléans , France
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Bahadorikhalili S, Sardarian AR. KF-Al2O3 as a Base Heterogeneous Catalyst for the Synthesis of 2-Substituted Benzoxazoles and Benzothiazoles under Mild Reaction Conditions at Room Temperature. Polycycl Aromat Compd 2018. [DOI: 10.1080/10406638.2018.1517808] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
| | - Ali Reza Sardarian
- Department of Chemistry, College of Sciences, Shiraz University, Shiraz, Iran
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Bučko T, Šimko F. Effect of alkaline metal cations on the ionic structure of cryolite melts: Ab-initio NpT MD study. J Chem Phys 2018; 148:064501. [DOI: 10.1063/1.5017106] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Affiliation(s)
- Tomáš Bučko
- Department of Physical and Theoretical Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Ilkovičova 6, SK-84215 Bratislava, Slovakia
- Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravska cesta 9, SK-84236 Bratislava, Slovakia
| | - František Šimko
- Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravska cesta 9, SK-84236 Bratislava, Slovakia
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