Single-phase ceramics with La1-xSrxGa1-yMgyO3-δ composition from precursors obtained by mechanosynthesis

被引：21
作者：
Moure, A. [1 ]
Castro, A. [2 ]
Tartaj, J. [1 ]
Moure, C. [1 ]
机构：
[1] CSIC, Inst Ceram & Vidrio, Madrid 28049, Spain
[2] CSIC, Inst Ciencia Mat Madrid, Madrid 28049, Spain
来源：
JOURNAL OF POWER SOURCES | 2009年 / 188卷 / 02期
关键词：
Solid oxide fuel cell; Electrolyte; Lanthanum-gallate; Mechanosynthesis; OXIDE-ION CONDUCTOR; MG-DOPED LAGAO3; PEROVSKITE-TYPE OXIDE; LANTHANUM GALLATE; FUEL-CELLS; MECHANOCHEMICAL ACTIVATION; MECHANICAL ACTIVATION; SOLID ELECTROLYTES; COMPLEX OXIDES; SR;
D O I：
10.1016/j.jpowsour.2008.11.103
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Dense ceramics with La0.80Sr0.20Ga0.85Mg0.15O2.825 and La0.80Sr0.15Ga0.85Mg0.20O2.825 compositions have been prepared by sintering of mechanosynthesized precursors. The perovskite is synthesized after 85 h of milling in a planetary mill. Single phases have been obtained at conditions that are not possible if traditional solid-state reaction (SSR) method is used. The influence of milling time and composition in the reactivity of the precursors is studied. Highest purity is obtained in Sr = 0.15 and Mg = 0.20 composition, with relative density higher than 97%. The total elimination of typical secondary phases for these compositions, as SrLaGaO4 and SrLaGa3O7, allows the total conductivity of the ceramics to be improved. The influence of the grain size and the nature of the grain boundaries an the electrical characteristic of the ceramics are also discussed. (C) 2008 Elsevier B.V. All rights reserved.
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页码：489 / 497
页数：9
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