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Title: Synthesis of nanocrystalline yttria through in-situ sulphated-combustion technique
Authors: Mangalaraja, R V
Ananthakumar, S
Mouzon, J
Uma, K
Lopez, M
Camurri, C P
Oden, M
Keywords: Ceramics
SO42- ions
Issue Date: 2009
Publisher: Ceramic Society of Japan
Citation: Journal of the Ceramic Society of Japan 117(10):1065-1068;Oct 2009
Abstract: An in-situ sulphated-combustion reaction was conducted on the precursor mixture consisting of yttrium nitrate, organic fuels (urea, citric acid and glycine) and 10 mol% ammonium sulphate [(NH4)(2)SO4] at 500 degrees C. Effect of sulphate addition on yttria particles morphology has been analyzed with respect to the types of fuels. In un-sulphated combustion, the calcined yttria powders showed rectangular particle morphology and low specific surface area. Whereas in sulphated-combustion spherical shaped yttria particles were achieved for glycine fuel. In the case of citric acid fuel, yttria powders with high specific surface area [26 m(2)/g] were obtained. For all the fuels, the sulphated-combustion reaction produced nanocrystalline yttria powders and they also had primary crystallite size below 4 nm in the as prepared conditions. Upon calcination at 1100 degrees C, these powders attained mean particle size of 50 nm which was confirmed by TEM
ISSN: 1882-0743
Appears in Collections:2009

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