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

Autor:	A. V. Teterskii, S. Yu. Stefanovich, N. Ya. Turova
Rok vydání:	2006
Předmět:	Materials science General Chemical Engineering Inorganic chemistry Metals and Alloys Oxide Sintering Conductivity Microstructure Apatite Tetraethyl orthosilicate Inorganic Chemistry chemistry.chemical_compound chemistry visual_art Materials Chemistry visual_art.visual_art_medium Ceramic Sol-gel
Zdroj:	Inorganic Materials. 42:294-302
ISSN:	1608-3172 0020-1685
DOI:	10.1134/s0020168506030150
Popis:	Oxygen-ion-conducting orthosilicates were synthesized for the first time by a sol-gel process. Apatite-structure compounds with the general formula M 2 II 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.
Databáze:	OpenAIRE
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