Ion mobility and conductivity in the K0.45Bi0.55–In F2.1 solid solutions with fluorite structure according to 19F NMR and conductivity data

Kavun, V. Ya.; Уваров, Н. Ф.; Slobodyuk, A. B.; Polyantsev, M. M.; Ulihin, Artem S.; Merkulov, E. B.; Гончарук, В. К.

doi:10.1016/j.ssi.2018.12.004

Cited by 6 publications

(1 citation statement)

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“…The decomposition of the 19 F NMR spectra of synthesized samples into components characterizing certain positions of fluorine anions in the lattice (Fig. 7) has been performed according to Gabuda, et al 33 and Kavun et al 34 Since the area of the spectral components is proportional to the amount of fluorine anions, which are in one position or another, their fraction in the structure of the fluoride ion conducting phase at different temperatures can be quantitatively estimated in a first approximation. For instance, the fraction of the "highly mobile" fluorine anions that are in the interstitial spaces of the lattice (position F(3), spectral component P 3 ) at 150 K is not over 26 % and increases with rising temperature to 63 % at 300 K and 87 % at 453 K owing to drawing in fluoride ions from locally mobile position F(2) and immobile position F(1) (Fig.…”

Section: O N L I N E F I R S Tmentioning

confidence: 99%

Fluoride ion conductivity of solid solutions KxPb0.86-xSn1.14F4-x

Pohorenko

Pshenychnyi

Pavlenko

et al. 2021

JSCS

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The electrical conductivity of solid solutions with tetragonal syngony formed in 0.86(xKF - (1-x)PbF2) - 1.14SnF2 systems has been studied by 19F NMR and impedance spectroscopy. It was found that the Pb0.86Sn1.14F4 phase is characterized by better values of fluoride-ion conductivity than the ?-PbSnF4 compound. It was found that the substitution of Pb2+ ions by K+ up to ? = 0.07 in the structure of Pb0.86Sn1.14F4 contributes to increase in electrical conductivity by an order of magnitude relative to the original Pb0.86Sn1.14F4. The sample of the composition K0.03Pb0.83Sn1.14F3.97 has the highest electrical conductivity (?600 = 0.38 S cm-1, ?330 = 0.01 S cm-1). The fluoride anions in the synthesized samples of KxPb0.86-xSn1.14F4-x solid solutions occupy three structurally nonequivalent positions. It is shown that with increasing temperature, there is a redistribution of fluorine anions between positions in the anion lattice, which results in an increase in the concentration of highly mobile fluoride ions, which determine the electrical conductivity of samples.

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Section: O N L I N E F I R S Tmentioning

confidence: 99%