Time-differential perturbed-angular-correlation study of phase transitions and molecular motions inK3(Hf,Zr)F7

Structural, thermal and optical properties of elpasolite-like (NH4)2KZrF7

“…Such a strong effect of partial cationic substitution on the structure and physical properties seems unexpected, especially considering that in the K 3 ZrF 7 complex, the orthorhombic phase is assumed [15,17,27]. In connection with the above, of undoubted interest is the study of (NH 4 ) 3-x K x ZrF 7 solid solutions with potassium concentrations x < 1.…”

Probing the ionic structure of FLiNaK–ZrF4 salt mixtures by solid-state NMR

“…All of the 19 F, 23 Na and 7 Li solid-state NMR experiments were performed on a Bruker Avance NEO 400 WB spectrometer with a magnetic eld of 9.4 T, operating at frequencies of 376.61 MHz, 105.87 MHz and 155.55 MHz, respectively. The data was collected using a 3.2 mm double-resonance magic angle spinning (MAS) probe and a 15 kHz spinning rate at room temperature.…”

“…As compared with other IR or Raman spectroscopy, high-resolution NMR method refers to a powerful method to investigate the local structure of ZrF 4 -based systems. [11][12][13][14] The high resolution of the NMR signals and the multiple detectable elements ( 7 Li, 19 F, 23 Na) are capable of presenting specic microstructure information of the zirconium ions in complex salt system. For instance, Pauvert et al 15 reported the structural evolution of the free uoride ions and other Zr-F ions in LiF-ZrF 4 system.…”

“…In this study, the coordination structure of [Zr x F y ] 4xÀy in FLiNaK-ZrF 4 eutectic salts was investigated specically with high resolution solid-state NMR method. 16 7 Li, 19 F and 23 Na NMR spectra were adopted to analyze the chemical environment of zirconium ions, as well as the evolution of the different ionic species. As indicated from the results, K 3 ZrF 7 , Na 3 ZrF 7 and Na 7 Zr 6 F 31 crystal phases were formed when the melt FLiNaK-ZrF 4 salts were being solidied.…”

“…

In this study, by applying 19 F, 23 Na and 7 Li high-resolution NMR methods, the evolution of the [Zr x F y ] 4xÀy local ionic structures in FLiNaK-ZrF 4 salt mixtures were elucidated. K 3 ZrF 7 , Na 3 ZrF 7 and Na 7 Zr 6 F 31 crystal phases were identified when the melt salts were being solidified.

…”