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Sol-gel synthesis of oxygen-ion conductors based on apatite-structure silicates and silicophosphates

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Abstract

Oxygen-ion-conducting orthosilicates were synthesized for the first time by a sol-gel process. Apatite-structure compounds with the general formula M II2 Ln8 (SiO4)6O2 (MII = Ca, Sr, Pb; Ln = La, Pr, Nd, Gd, Er, Yb) were prepared by reacting tetraethyl orthosilicate, Si(OEt)4, with divalent-metal ethoxides or nitrates and rare-earth nitrates in aqueous-ethanolic solutions. The formation of oxide phases during heat treatment of xerogels obtained by a sol-gel process was studied. By sintering ground xerogels, high-strength, pore-free ceramics were prepared, which are superior to ceramics prepared through standard solid-state reactions in electrical properties and microstructure and are close in conductivity to single-crystal analogs.

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Authors and Affiliations

  1. Moscow State University, Vorob’evy gory 1, Moscow, 119899, Russia

    A. V. Teterskii, S. Yu. Stefanovich & N. Ya. Turova

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  1. A. V. Teterskii
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  2. S. Yu. Stefanovich
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  3. N. Ya. Turova
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Original Russian Text © A.V. Teterskii, S.Yu. Stefanovich, N.Ya. Turova, 2006, published in Neorganicheskie Materialy, 2006, Vol. 42, No. 3, pp. 340–348.

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Teterskii, A.V., Stefanovich, S.Y. & Turova, N.Y. Sol-gel synthesis of oxygen-ion conductors based on apatite-structure silicates and silicophosphates. Inorg Mater 42, 294–302 (2006). https://doi.org/10.1134/S0020168506030150

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  • DOI: https://doi.org/10.1134/S0020168506030150

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