Synthesis, sinterability and ionic conductivity of nanocrystalline La2Mo209 powders

John Thomas Sirr Irvine, D Marrero-Lopez, J Canales-Vazquez, JC Ruiz-Morales, A Rodriguez, P Nunez

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58 Citations (Scopus)

Abstract

A modified freeze-dried method has been used to obtain polycrystalline powders of the ionic conductor La2Mo2O9. Such ceramic powders were characterized by TG/DTA, XRD, SEM and TEM, and their sinterability was analysed by dilatometry and isothermal sintering studies. The nanocrystalline powders possessed high reactivity and good sinterability, producing dense pellets at only 1023 K with an average grain size of 1.5 mu m. Bulk and grain boundary conductivities of La2Mo2O9 have been investigated by impedance spectroscopy in samples sintered in a range of temperatures, i.e. between 1023 and 1373 K, and their magnitudes correlated with the microstructure. A significant grain boundary resistance was found for sintered samples prepared at temperatures below 1173 K, causing a pronounced decrease in the overall conductivity, even at high temperature. This contribution however was minimised upon sintering at temperatures above 1173 K, yielding ionic conductivity values of 0.12 S/cm at 1073 K. (c) 2005 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)1807-1816
Number of pages10
JournalSolid State Ionics
Volume176
DOIs
Publication statusPublished - Jul 2005

Keywords

  • La2Mo2O9
  • freeze-dried precursor
  • phase transition
  • impedance spectroscopy
  • grain boundary
  • ion blocking
  • TRANSPORT-PROPERTIES
  • LAMOX FAMILY
  • CONDUCTORS
  • CERAMICS
  • CERIA
  • GD

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