Abstract
Combined with Raman spectroscopy and theoretical calculations, the tantalum fluoride and oxyfluoride ions in molten FLiNaK were studied. Firstly, the Raman spectra of K2TaF7 were recorded from 298 to 973 K and no structural evolution was observed. The coexistence of TaF72– and TaF83– anions was confirmed in K2TaF7 and molten FLiNaK-K2TaF7 mixtures. With the addition of Li2O (3 mol%), the terminal oxo ligands TaOF52– and TaOF63– were formed at the expense of TaF72– and TaF83– with the release of free F– ions, respectively. When the Li2O content increased to 13 mol%, two new oxyfluorides TaO2F2– and TaO2F32– were observed that contained two non-bridging oxygens. As the content of Li2O further increased to 40 mol%, insoluble solid tantalum oxide species like β-Ta2O5 was found, which indicates the transformation of intermediate oxyfluorides formed by the reaction of TaF72– and TaF83– fluorides with O2– in molten FLiNaK to oxides.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
