Abstract
The compositions of nonstoichiometric phases Pb1 – xRxF2 + x (CaF2 type, R is a rare-earth element) have been optimized with respect to the ionic conductivity and thermal stability based on the temperature measurements of the electrical conductivity of single crystals and alloys, in dependence of their R3+ ionic radius and RF3 content, and on the analysis of the phase diagrams of the PbF2–RF3 systems. It is shown that Pb0.95Yb0.05F2.05 and Pb0.9Sc0.1F2.1 crystals have the highest conductivities among the Pb1 – xRxF2 + x phases (σ500 K = 9.3 × 10–3 and 2.0 × 10–2 S/cm and σ293 K = 1.4 × 10–6 and 1.5 × 10–4 S/cm, respectively). The conductivity σ293 K of the solid electrolyte Pb0.9Sc0.1F2.1 is sufficient for using it in room-temperature fluorine-ion sensors and current sources.
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This study was supported by the Ministry of Science and Higher Education of the Russian Federation within the State assignment for the Federal Scientific Research Centre “Crystallography and Photonics” of the Russian Academy of Sciences.
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Sorokin, N.I., Sobolev, B.P. Optimization of the Compositions of Solid Electrolytes Pb1 – xRxF2 + x with Fluorite-Type Structure in Conductivity and Thermal Stability. Crystallogr. Rep. 65, 98–105 (2020). https://doi.org/10.1134/S1063774520010241
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DOI: https://doi.org/10.1134/S1063774520010241