Ion transport in the anion-deficient nonstoichiometric phases La0.95(Ba1−x Srx)0.05F2.95 (0⩽x⩽1)

Сорокин, Н. И.; Фоминых, М. В.; Кривандина, Е. А.; Жмурова, З. И.; Соболев, Б. П.; Lyamina, O. I.

doi:10.1134/1.1130362

Cited by 10 publications

(15 citation statements)

References 12 publications

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“…The compositions of tysonite FSEs were previously optimized based on the high temperature measure ments of the dependences σ(T) [35][36][37][38][39][40][41][42][43][44][45][46]. These data can be used to determine σ(293 К) only if the correct ness of extrapolating high temperature dependences to 293 K is proven.…”

Section: High and Low Temperature Measurements Of σmentioning

confidence: 99%

“…The purpose of this cycle of studies (two in number) is to perform systematic optimization (with respect to thermal stability and σ(293 К) value) of single crystals of two component tysonite nonstoichiometric phases R 1 -y M y F 3 -y (R = La-Lu, Y; M = Ca, Sr, Ba) in the MF 2 -RF 3 systems [25,33], for which high tempera ture investigations of σ were performed previously in [35][36][37][38][39][40][41][42][43][44][45][46][47].…”

Section: Procedures Used To Increase Ionic Conductivitymentioning

confidence: 99%

“…The decomposition of tysonite crystals under certain tem perature conditions limits their practical application in thermally cycled devices. Because of this limitation, along with the optimization with respect to σ(293 К), the optimization of high conductivity compositions with respect to thermal stability should be performed [35][36][37][38][39][40][41][42][43][44][45][46][47].…”

Section: Procedures Used To Increase Ionic Conductivitymentioning

confidence: 99%

“…(v) True σ dc values and the possibility for optimiz ing tysonite phases with respect to this parameter are provided by the systematic study of ion transport on single crystals of tysonite nonstoichiometric phases R 1 -y M y F 3 -y (R = La -Lu, Y; M = Ca, Sr, Ba) that was performed at the IC RAS [35][36][37][38][39][40][41][42][43][44][45][46][47];…”

Section: Practical Application Of R 1 -Y M Y F 3 -Y Fses With Tysonitmentioning

confidence: 99%

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293-K conductivity optimization for single crystals of solid electrolytes with tysonite structure (LaF3): I. Nonstoichiometric phases R 1−yCayF3−y (R = La-Lu, Y)

et al. 2014

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The systematic optimization of single crystal fluoride conducting solid electrolytes R 1 -y Ca y F 3 -y with a tysonite type structure (LaF 3 ) with respect to the conductivity at room temperature, σ(293 K), is based on high temperature measurements of σ(T) of stoichiometric fluorides of rare earth elements, RF 3 (R = La-Nd), in dependence of the radius R 3+ ( ); two component stoichiometric La 1 -y R y F 3 phases (R = Pr, Nd) in dependence on the average cation radius (r cat ); and two component nonstoichiometric phases R 1 -y Ca y F 3 -y (R = La-Lu, Y) in dependence of the CaF 2 content. The optimization of the compo sition with respect to thermal stability is based on studying the phase diagrams of CaF 2 -RF 3 systems and the behavior of R 1 -y Ca y F 3 -y crystals upon heating when measuring temperature dependences σ(T). Single crystal samples of a number of investigated R 1 -y Ca y F 3 -y compounds has σ(293 K) values high enough to be applied in solid state electrochemical devices operating at room temperature (chemical sensors, fluorine ion batteries, and accumulators) and in devices subjected to thermal cycling.

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Section: High and Low Temperature Measurements Of σmentioning

confidence: 99%

Section: Procedures Used To Increase Ionic Conductivitymentioning

confidence: 99%

Section: Procedures Used To Increase Ionic Conductivitymentioning

confidence: 99%

Section: Practical Application Of R 1 -Y M Y F 3 -Y Fses With Tysonitmentioning

confidence: 99%

See 2 more Smart Citations

293-K conductivity optimization for single crystals of solid electrolytes with tysonite structure (LaF3): I. Nonstoichiometric phases R 1−yCayF3−y (R = La-Lu, Y)

et al. 2014

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“…Isomorphic replacement of the matrix cations R 3+ by M 2+ ions results in strong impurity disordering of the anionic sublattice; the fluoride-ion-involving conductivity of R 1x M x F 3x may be as high as σ ~ 10 -4 to 10 -3 S/cm at 293 K. The conduction of these solid solutions was studied in [3][4][5] at 293-750 K. Electrical properties of crystalline R 1x M x F 3x have barely been studied at both low and high temperatures. Among solid solutions Nd 1x Sr x F 3x (0 < x ≤ 0.15) , maximum σ occurs at x = 0.05 [4]. Here we study impedance spectra of an Nd 0.95 Sr 0.05 F 2.95 crystal at 94-1072 K with silver electrodes.…”

Section: Introductionmentioning

confidence: 99%

Impedance of the Ag|Nd0.95Sr0.05F2.95 Crystal|Ag System

Сорокин

2005

Russ J Electrochem

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Electrochemical studies of the Ag|Nd 0.95 Sr 0.05 F 2.95 crystal|Ag system at 94 to 1072 K are carried out using impedance measurements over the 10 -1 to 10 7 Hz frequency range. Contributions of conduction and bulk and electrode polarization are distinguished in the impedance spectra of the Ag | Nd 0.95 Sr 0.05 F 2.95 | Ag cell. Anionic conductivity of the Nd 0.95 Sr 0.05 F 2.95 crystal varies from 3 × 10 -13 to 0.4 S/cm. The mechanism of anionic conduction and models for the electrode and bulk polarization are discussed.

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