Synthesis of nanopowders of the aluminum-substituted lanthanum gallate solid electrolyte by mechanochemical route

Eddy Domingues, Priscila Gonçalves, Filipe M. Figueiredo*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The room temperature mechanosynthesis of La 1-xSr xGa 1-y-zMg yAl zO 3-δ nanopowders is successfully demonstrated for a broad compositional range (x ≤ 0.1; y ≤ 0.2, z ≤ 0.4) by resorting to a nearly amorphous alumina precursor with enhanced reactivity. It is shown that ceramics with one single phase and free from open porosity can be obtained by sintering these nanopowders at 1350-1450 °C. Microstructural data show that the substitution of Ga by Al hinders densification and decreases the grain size of ceramics. This is explained assuming the segregation of aluminum cations to the grain boundaries as a result of the decrease of the cationic diffusion coefficients.

Original languageEnglish (US)
Pages (from-to)820-827
Number of pages8
JournalSolid State Sciences
Volume14
Issue number7
DOIs
StatePublished - Jul 1 2012

Keywords

  • Lanthanum gallate
  • Mechanosynthesis
  • SOFC
  • Sintering
  • Solid electrolyte

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Synthesis of nanopowders of the aluminum-substituted lanthanum gallate solid electrolyte by mechanochemical route'. Together they form a unique fingerprint.

Cite this