Investigation of thermal properties and structure of complex fluoride K3ZrF7

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

“…With the increase in the concentration of ZrF 4 , the strength of F 0 1 site decreased F 0 1 rapidly, and that of F 00 1 and F 000 1 sites increased. Moreover, the new F 00 1 and F 000 1 signals were observed to be broadened compared with F 0 1 : In accordance with the existing reports, [22][23][24] three crystal phases could exist in K 3 ZrF 7 , i.e., orthorhombic, tetragonal and disordered cubic lattice. Formation of the disordered cubic crystal phase always leads to the reduction of the crystallinity, and the broadening of the NMR signals should originate from the formation of the disordered crystal phase in the eutectic salt.…”