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La 28− x W 4+ x O 54+3 x /2 Powders Prepared by Spray Pyrolysis
Author(s) -
Gil Vanesa,
Strøm Ruth A.,
Groven Lori J.,
Einarsrud MariAnn
Publication year - 2012
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2012.05377.x
Subject(s) - tungstate , sintering , lanthanum , grain size , materials science , particle size , microstructure , aqueous solution , grain growth , analytical chemistry (journal) , crystallography , mineralogy , nuclear chemistry , chemical engineering , chemistry , inorganic chemistry , metallurgy , chromatography , engineering
Here we report the first aqueous solution‐based synthesis route to lanthanum tungstate nanopowders ( La 28− x W 4+ x O 54+3 x /2 ). Lanthanum tungstate‐based materials have high proton conductivity at elevated temperatures making them interesting for several energy technology applications. The La 28− x W 4+ x O 54+3 x /2 powders prepared by developing a new aqueous precursor solution have a narrow particle size distribution with an average grain size of 100 nm. Different pre‐consolidation conditions were studied to enhance powder performance. Dense, single phase materials with homogeneous microstructures with grain size ~4 μm were obtained using sintering temperatures at 1400°C in air. Changing the La / W ‐ratio from 5.6 to 5.4 did not affect the densification rate, however, a slight increase in grain growth rate was observed.