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

abstract

The room temperature mechanosynthesis of La1-xSrxGa1-y-zMgyAlzO3-delta 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 degrees 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. (C) 2012 Elsevier Masson SAS. All rights reserved.

keywords

ELECTRICAL-PROPERTIES; PHASE-COMPOSITION; DOPED LAGAO3; OXIDE; CONDUCTIVITY; MAGNESIUM; STRONTIUM; SYSTEM; MECHANOSYNTHESIS; LSGM

subject category

Chemistry; Physics

authors

Domingues, EM; Goncalves, P; Figueiredo, FM

our authors

acknowledgements

This work was supported by FCT project POCI/CTM/59727/2004 (Portugal) and the NOE FAME (CEC, Brussels).

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