Synthesis of nanopowders of the aluminum-substituted lanthanum gallate solid electrolyte by mechanochemical route
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
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journal impact factor 1.861
5 year journal impact factor 1.892
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