Crystal Structures of Li4ZrF8 and Li3Zr4F19 and Reinvestigation of the LiF-ZrF4 Phase Diagram

Li2PbF6 and SrPbF6 Revisited

“…The distance between the Li and the F atom [2.057(5) Å], is in good agreement with those in other fluoridometallates(IV) (e.g. : Li 2 GeF 6 , 1.961–2.186 Å, ht modification, P 321, 293 K; Li 4 ZrF 8 , 1.841–2.256Å, Pnma , 298 K) , . The Pb–F distance [1.997(7) Å] is also in good agreement with previously reported data for metal(II) hexafluoridoplumbates(IV) M PbF 6 [ M = Mg (1.99 Å), Ni (1.99 Å), Zn (1.97 Å)] …”

“…: Li 2 GeF 6 , 1.961-2.186 Å, ht modification, P321, 293 K; Li 4 ZrF 8 , 1.841-2.256Å, Pnma, 298 K). [13,39] The Pb-F distance [1.997 (7) Å] is also in good agreement with previously reported data for metal(II) hexafluoridoplumbates(IV) MPbF 6 [M = Mg (1.99 Å), Ni (1.99 Å), Zn (1.97 Å)]. [2] The IR spectrum ( Figure S2, Supporting Infomation) shows a band at 475 cm -1 which is comparable with the band at approximately 500 cm -1 for the [PbF 6 ] 2anion in hydrated hexafluoridoplumbates(IV).…”

Redetermination of the crystal structure of tetralithium octafluoridozirconate(IV), Li4ZrF8, from single-crystal X-ray data

“…As a result, a re-evaluation of data is necessary in some areas. High-quality structure models of Li 2 ZrF 6 and Li 3 Zr 4 F 19 from single-crystal data have previously been discussed in the literature (Brunton, 1973;Dugat et al, 1995). The structure of Li 4 ZrF 8 was reported to be isotypic to the uranium species by powder X-ray diffraction (Dugat et al, 1995), but no refined structure model from single-crystal data has been reported to date.…”

Protection of nuclear graphite toward fluoride molten salt by glassy carbon deposit

“…Representation of the ternary phase diagram in Fig. 2 was taken from the study of Thoma et al [8] without taken into account the Li 4 ZrF 8 phase [9,10]. PXRD analysis on the resulting cooled fluoride salt, after heating at 500°C, showed the presence of these three phases.…”