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

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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

foto Eddy Michael Pedro Domingues

Eddy Michael Pedro Domingues

Post-Doc Fellowship
foto Filipe Miguel H Lebre R Figueiredo

Filipe Miguel H Lebre R Figueiredo

Principal Researcher

Groups

3 - Carbon Materials, Composites and Functional Coatings

Projects

Core-shell ceramic membranes with nano-sized grains for oxygen separation and syn-gas production (POCI/CTM/59727/2004)
Functionalised Advanced Materials and Engineering of Hybrids and Ceramics - FAME (FAME)

acknowledgements

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

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Publication Details

type
Journal Article
year
2012
journal
SOLID STATE SCIENCES
volume
14
publisher
ELSEVIER SCIENCE BV
issn
1293-2558
issue
7
digital object identifier
10.1016/j.solidstatesciences.2012.03.028
web of science article identifier
WOS:000307032500011

Journal Metrics (JCR 2019)

Journal Impact Factor
2.434
Journal Impact Factor (5 yrs)
2.039
category normalized journal percentile
52.685

Citations

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