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Journal of Structural Chemistry

2008 year, number 6

IONIC MOBILITY IN AMMONIUM-RUBIDIUM HEPTAFLUOROZIRCONATE (NH4)2.4Rb0.6ZrF7 BY (1H, 19F) NMR DATA

V. Y. Kavun, I. A. Tkachenko, N. A. Didenko, V. I. Sergienko
Keywords: NMR (19F, 1H) spectra, ammonium-rubidium heptafluorozirconate, ionic mobility, ionic conductivity
Pages: 1081-1085

Abstract

NMR (19F, 1H) methods are used to study ionic mobility in heptafluorozirconate (NH4)2.4Rb0.6ZrF7 in a range of temperatures from 150 K to 430 K. Types of ionic movements are determined, and their activation energy is evaluated. As a result of a phase transition a modification forms in which diffusion in the ammonium sublattice and isotropic reorientations of ZrF3-7 complex anions are observed. According to preliminary data, due to diffusion of ammonium ions the compound has relatively high ionic conductivity (σ ≈ 8.3×10-5 S/cm at 423 K).