Anion conductivity of a Ce0.95Gd0.05O0.075F2.85 solid electrolyte

Сорокин, Н. И.; Каримов, Д. Н.; Sulyanov, S. N.; Кривандина, Е. А.; Жмурова, З. И.; Соболев, Б. П.

doi:10.1134/s0020168514050173

Cited by 5 publications

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“…Studies of the electrophysical properties of threecomponent solid solutions, in which the composition of a rare-earth (R, R ′ ) or matrix (M, M ′ ) sublattice varies, are just beginning. To date, measurements have been made of the ionic conductivity of crystals Sr 0.8 (La 1−x Lu x ) 0.2 F 2.2 [4], (Ca 1−x Sr x ) 0.85 Nd 0.15 F 2.15 , Ba 0.75 (La 1−x Nd x ) 0.25 F 2.25 [29], (Sr 1−x Ba x ) 0.7 La 0.3 F 2.3 [29,30] and solid solutions whose compositions correspond to saddle points on the phase diagrams of the ternary systems CaF 2 −SrF 2 −RF 3 (R = La−Nd) [31,32].…”

Section: Introductionmentioning

confidence: 99%

Mechanism of electrotransport in superionic conductor Sr-=SUB=-0.7-=/SUB=-La-=SUB=-0.15-=/SUB=-Lu-=SUB=-0.15-=/SUB=-F-=SUB=-2.3-=/SUB=- with the fluorite-type structure

Sorokin

Каримов

2023

Physics of the Solid State

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The ionic conductivity of the superionic conductor Sr0.7La0.15Lu0.15F2.3 with the fluorite-type structure (type CaF2, sp. gr. Fm3m) had measured by the impedance spectroscopy in the temperature range 385-794 K. Bulk crystals of a three-component solid solution (lattice parameter a=5.7726(1) Angstrem) had obtained from the melt by the directed crystallization technique. Temperature dependence ionic conductivity sigmadc(T) satisfies the Arrhenius--Frenkel equation with the activation enthalpy of the electrical conductivity Delta Hsigma=0.706± 0.05 eV. The value of sigmadc is 1.5·10-5 S/cm at 500 K. Based on the analysis of electrophysical and structural studies of fluorite-type solid solutions in SrF2-LaF3 and SrF2-LuF3 systems, the microscopic model of ion transport in the Sr0.7La0.15Lu0.15F2.3 crystal was proposed. The concentration and mobility of charge carriers were calculated: nmob=7.8·1020 cm-3 and μmob=1.2·10-7 cm2/Vs at 500 K. Keywords: superionic conductors, impedance spectroscopy, single crystals, fluorides, rare earth ions, fluorite structure.

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