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

Eddy M. Domingues; Priscila Gonçalves; Filipe M. Figueiredo

doi:10.1016/j.solidstatesciences.2012.03.028

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

Eddy M. Domingues, Priscila Gonçalves, Filipe M. Figueiredo^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

The room temperature mechanosynthesis of La _1-xSr _xGa _1-y-zMg _yAl _zO _3-δ 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 °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.

Original language	English (US)
Pages (from-to)	820-827
Number of pages	8
Journal	Solid State Sciences
Volume	14
Issue number	7
DOIs	https://doi.org/10.1016/j.solidstatesciences.2012.03.028
State	Published - Jul 2012
Externally published	Yes

Keywords

Lanthanum gallate
Mechanosynthesis
SOFC
Sintering
Solid electrolyte

ASJC Scopus subject areas

General Chemistry
General Materials Science
Condensed Matter Physics

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10.1016/j.solidstatesciences.2012.03.028

Cite this

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title = "Synthesis of nanopowders of the aluminum-substituted lanthanum gallate solid electrolyte by mechanochemical route",

abstract = "The room temperature mechanosynthesis of La 1-xSr xGa 1-y-zMg yAl zO 3-δ 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 °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.",

keywords = "Lanthanum gallate, Mechanosynthesis, SOFC, Sintering, Solid electrolyte",

author = "Domingues, {Eddy M.} and Priscila Gon{\c c}alves and Figueiredo, {Filipe M.}",

year = "2012",

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doi = "10.1016/j.solidstatesciences.2012.03.028",

language = "English (US)",

volume = "14",

pages = "820--827",

journal = "Solid State Sciences",

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TY - JOUR

T1 - Synthesis of nanopowders of the aluminum-substituted lanthanum gallate solid electrolyte by mechanochemical route

AU - Domingues, Eddy M.

AU - Gonçalves, Priscila

AU - Figueiredo, Filipe M.

PY - 2012/7

Y1 - 2012/7

N2 - The room temperature mechanosynthesis of La 1-xSr xGa 1-y-zMg yAl zO 3-δ 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 °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.

AB - The room temperature mechanosynthesis of La 1-xSr xGa 1-y-zMg yAl zO 3-δ 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 °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.

KW - Lanthanum gallate

KW - Mechanosynthesis

KW - SOFC

KW - Sintering

KW - Solid electrolyte

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U2 - 10.1016/j.solidstatesciences.2012.03.028

DO - 10.1016/j.solidstatesciences.2012.03.028

M3 - Article

AN - SCOPUS:84861014755

SN - 1293-2558

VL - 14

SP - 820

EP - 827

JO - Solid State Sciences

JF - Solid State Sciences

IS - 7

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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