Lanthanum zirconate nanoparticles and ceramics produced using a nitrate-modified alkoxide synthesis route |
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Authors: | Elena-Daniela Ion Barbara Malic Marija Kosec |
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Affiliation: | (1) Department of Electronic Ceramics, Jožef Stefan Institute, Ljubljana, 1000, Slovenia;(2) National Institute of Materials Physics, Bucharest-Magurele, MG-7, 077125, Romania |
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Abstract: | Fine lanthanum zirconate powder was prepared by thermally decomposing a nitrate-alkoxide-based precursor derived from dehydrated lanthanum nitrate, zirconium n-butoxide and 2-methoxyethanol. Upon heating, the decomposition of the organic groups was promoted by the nitrate groups, yielding a porous powder that crystallized into a pyrochlore phase at 800 °C. The powder that was heat treated at 900 °C for 1 h was composed of friable agglomerates of approximately 60-nm-sized nanoparticles. The ceramics obtained from the powder heat treated at 900 °C and milled for 30 min reached a relative density of 97.9 % after sintering at 1,400 °C for 10 h, which is at least 100 °C lower than the typically reported temperatures for this material. |
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Keywords: | La2Zr2O7 Powder-chemical preparation Precursors-organic Sintering Electron microscopy |
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