F-19 and H-1 NMR spectra, ionic mobility, and phase transitions in thallium(I)/ammonium hexafluorohafnates

Authors
Kavun, VY Sergienko, VI Gabuda, SP Davidovich, RL
Citation
Vy. Kavun et al., F-19 and H-1 NMR spectra, ionic mobility, and phase transitions in thallium(I)/ammonium hexafluorohafnates, J STRUCT CH, 41(4), 2000, pp. 597-602
Citations number
15
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF STRUCTURAL CHEMISTRY
ISSN journal
00224766 → ACNP
Volume
41
Issue
4
Year of publication
2000
Pages
597 - 602
Database
ISI
SICI code
0022-4766(200007/08)41:4<597:FAHNSI>2.0.ZU;2-1
Abstract
Ionic mobility in (NH4)(2)HfF6 (I), Tl2HfF6 (II), and NH4TlHfF6 (III) has b een studied by IH and 19F NMR in the temperature range 160-440 K. Types of ionic motion are determined, and activation energies are estimated. Phase t ransitions are found at similar to 390 and similar to 365 K for II and III. Compounds I and III are assumed to be superionic conductors in the tempera ture range 370-420 K.