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