Šimko František, Rakhmatullin Aydar, Florian Pierre, Kontrík Martin, Korenko Michal, Netriová Zuzana, Danielik Vladimír, Bessada Catherine
Institute of Inorganic Chemistry, Slovak Academy of Sciences , 845 36 Bratislava, Slovakia.
Conditions Extrêmes ét Materiaux: Haute Température et Irradiation, UPR 3079-CNRS Univ. Orléans 450 71, Orléans, France.
Inorg Chem. 2017 Nov 6;56(21):13349-13359. doi: 10.1021/acs.inorgchem.7b02105.
Precise investigation of part of the phase diagram of KF-AlO system was performed in an experiment combining different techniques. Solidified mixtures of KF-AlO were studied by X-ray powder diffraction and high-field solid-state NMR spectroscopy over a wide range of compositions. To help with the interpretation of the NMR spectra of the solidified samples found as complex admixtures, we synthesized the following pure compounds: KAlO, KAlO, α-KAlF, KAlF, and KAlOF. These compounds were then characterized using various solid-state NMR techniques, including MQ-MAS and D-HMQC. NMR parameters of the pure compounds were finally determined using first-principles density functional theory calculations. The phase diagram of KF-AlO with the alumina content up to 30 mol % was determined by means of thermal analysis. Thermal analysis was also used for the description of the thermal stability of one synthesized compound, KAlOF.
