Low-temperature sintering of dense lanthanum silicate electrolytes with apatite-type structure using an organic precipitant synthesized nanopowder

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Highly sinterable La(10)Si(6)O(27) and La(10)Si(5.5)M(0.5)O(27) (M = Mg, and Al) nanopowders with apatite-type structure have been synthesized via a homogeneous precipitation method using diethylamine (DEA) as a precipitant. The synthetic approach using an organic precipitant with dispersant characteristics is advantageous in configuring weakly agglomerated nanopowders, leading to desirable sintering activity. X-ray diffraction powder patterns confirmed the single-phase crystalline lanthanum silicate of hexagonal apatite structure at 800 degrees C, which is a relatively lower calcination temperature compared to conventionally prepared samples. Transmission electron microscopy images revealed particles similar to 30 nm in size with a high degree of crystallinity. A dense grain morphology was recognized from the scanning electron microscopy images of the polished Surface of the pellets that were sintered at 1400 and 1500 degrees C for 10 h. This low-temperature sintering is significant because conventional powder processing requires a temperature above 1700 degrees C to obtain the same dense electrolyte. The doped-lanthanum silicate electrolyte prepared by the DEA process and sintered at 1500 degrees C for 10 h exhibited electrical conductivity comparable with samples prepared at Much higher sintering temperature (>1700 degrees C).
Publisher
MATERIALS RESEARCH SOC
Issue Date
2009-01
Language
English
Article Type
Article
Keywords

OXIDE FUEL-CELLS; IONIC-CONDUCTIVITY; RARE-EARTH; IT-SOFC; ENHANCEMENT; ZIRCONIA; SYSTEMS; POWDERS; GROWTH

Citation

JOURNAL OF MATERIALS RESEARCH, v.24, pp.237 - 244

ISSN
0884-2914
DOI
10.1557/JMR.2009.0018
URI
http://hdl.handle.net/10203/98378
Appears in Collection
MS-Journal Papers(저널논문)
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