Low-Temperature Pressureless Sintering of Sr- and Mg-Doped Lanthanum Gallate Ceramics by Sintering Atmosphere Control

Title
Low-Temperature Pressureless Sintering of Sr- and Mg-Doped Lanthanum Gallate Ceramics by Sintering Atmosphere Control
Authors
장재명이해원강석중
Issue Date
2009-04
Publisher
Journal of the American Ceramic Society
Citation
VOL 92, NO 4, 927-930
Abstract
The present investigation reports a new processing technique that can reduce the sintering temperature of Sr- and Mg-doped lanthanum gallate (LSGM), a good candidate material for the electrolyte of the solid oxide fuel cell (SOFC). When LSGM was sintered at 1623 K for 5 h in N2 or O2, the samples were densified over 98% relative density. In contrast, only 93% relative density was achieved after sintering in air, the conventional sintering atmosphere. As a result of better densification in N2 or O2, the electrical conductivity of the N2-sintered and air-annealed or the O2-sintered sample was higher than that of the airsintered sample by 30%. This result shows the beneficial effect of N2 or O2 sintering of LSGM and provides a high possibility of a low-temperature preparation of an LSGM-based SOFC.
URI
http://pubs.kist.re.kr/handle/201004/36998
ISSN
0002-7820
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KIST Publication > Article
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