Internal Mobility, Phase Transitions, and Ionic Conductivity in Na(NH4)6Zr4F23 and Li(NH4)6Zr4F23

Author： Kavun V.Y.   Sergienko V.I.   Uvarov N.F.   Antokhina T.F.  

Publisher： Springer Publishing Company

ISSN： 0022-4766

Source： Journal of Structural Chemistry, Vol.43, Iss.3, 2002-05, pp. : 429-435

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Abstract

The dynamics of fluoride and ammonium ions in Na(NH4)6Zr4F23 (I) and Li(NH4)6Zr4F23 (II) was studied by 1H and 19F NMR in the temperature range 170-440 K. Types of ionic motion were determined, and their activation energies were evaluated. In I, phase transitions were found in the temperature ranges 360-370 and 410-415 K. The experimental values of conductivity sigma of Na(NH4)6Zr4F23 and Li(NH4)6Zr4F23 (sigma ≈ 4 times 10^{-3} S/cm at T = 420 K) permit one to attribute these fluorides to the class of superionic conductors.

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