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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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