authors |
Domingues, EM; Goncalves, P; Figueiredo, FM |
nationality |
International |
journal |
SOLID STATE SCIENCES |
author keywords |
Mechanosynthesis; Sintering; Lanthanum gallate; Solid electrolyte; SOFC |
keywords |
ELECTRICAL-PROPERTIES; PHASE-COMPOSITION; DOPED LAGAO3; OXIDE; CONDUCTIVITY; MAGNESIUM; STRONTIUM; SYSTEM; MECHANOSYNTHESIS; LSGM |
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. |
publisher |
ELSEVIER SCIENCE BV |
issn |
1293-2558 |
year published |
2012 |
volume |
14 |
issue |
7 |
beginning page |
820 |
ending page |
827 |
digital object identifier (doi) |
10.1016/j.solidstatesciences.2012.03.028 |
web of science category |
Chemistry, Inorganic & Nuclear; Chemistry, Physical; Physics, Condensed Matter |
subject category |
Chemistry; Physics |
unique article identifier |
WOS:000307032500011
|