Conductivity of La0.95Sr0.05Ga0.90Mg0.10O3-delta obtained by mechanical activation
authors Gomes, E; Soares, MR; Figueiredo, FM; Marques, FMB
nationality International
journal JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
author keywords milling; grain boundaries; electrical conductivity; lanthanum gallate; fuel cells
keywords ION CONDUCTOR; DOPED LAGAO3; OXIDE; MAGNESIUM; STRONTIUM; CERAMICS
abstract Dense ceramics of La0.95Sr0.05Ga0.90Mg0.10O3-delta (LSGM) were obtained from La2O3, SrO, Ga2O3 and MgO precursors activated by dry grinding in a high-energy planetary ball-mill. Samples sintered at 1450 degrees C for 4 h have an average grain size of ca. 250 nm. This value increases to 5 mu m when the sample is annealed for 40 h at the same temperature. Samples prepared by a conventional ceramic route were also obtained with a grain size of 13.5 and 20.5 mu m, after sintering at 1550 degrees C for 4 and 40 h, respectively. Impedance spectroscopy data revealed similar grain conductivities for both materials. However, a significant degradation was observed on ageing the LSGM prepared by the conventional ceramic route, probably due to compositional alterations at the grain boundaries. This degradation was not present in the material prepared from mechanically activated precursors. Grain size effects on the electrical conductivity were analysed to determine the effective grain boundary conductivity and the brick-layer model is assumed to estimate the grain boundary thickness. (c) 2005 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0955-2219
year published 2005
volume 25
issue 12
beginning page 2599
ending page 2602
digital object identifier (doi) 10.1016/j.jeurceramsoc.2005.03.109
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000230569300129
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