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Ionics

, Volume 2, Issue 5–6, pp 442–445 | Cite as

Sol-gel synthesis of the lithium-ion conducting perovskite La0.57Li0.3TiO3 effect of synthesis and thermal treatments on the structure and conducting properties

  • T. Wöhrle
  • P. Gómez-Romero
  • T. Fries
  • K. West
  • M. R. Palacín
  • N. Casañ-Pastor
Article

Abstract

The lithium ionic conducting perovskite La0.57Li0.3TiO3 has been synthesised via a sol-gel method at a temperature of 700 °C. The crystallinity of the product can be greatly increased by further heat treatment at 1000 °C. In this paper the product of the sol-gel synthesis is compared with the product of conventional solid-state synthesis, and the influence of the synthesis method as well as of quenching on the crystal structure and ionic conductivity has been studied. AC-impedance measurements show two contributions to the ionic conductivity, which can be adscribed to intergranular and intragranular effects, respectively. A lower intergranular resistivity is observed for sol-gel samples, while quenching mainly affects the materials prepared by solid-state reaction. The crystal structure of the material prepared by the sol-gel method is identical to that of the material prepared by the solid state reaction, although the synthesis temperature is nearly 600 °C lower. A tetragonal superstructure is observed when either type of material is slowly cooled from 1300 °C. Quenching from the same temperature results in the suppression of that superstructure.

Keywords

Lithium Heat Treatment Perovskite Thermal Treatment Ionic Conductivity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© IfI - Institute for Ionics 1996

Authors and Affiliations

  • T. Wöhrle
    • 1
  • P. Gómez-Romero
    • 1
  • T. Fries
    • 1
  • K. West
    • 2
  • M. R. Palacín
    • 1
  • N. Casañ-Pastor
    • 1
  1. 1.Institut de Ciència de Materials de Barcelona, CSICCampus U.A.B.Bellaterra, BarcelonaSpain
  2. 2.Dept. of ChemistryTechnical University of DenmarkLyngbyDenmark

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