Synthesis of nanocrystalline yttria through in-situ sulphated-combustion technique
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概要
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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)2SO4] at 500°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 m2/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°C, these powders attained mean particle size of 50 nm which was confirmed by TEM.
著者
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Mangalaraja Ramalinga
Department of Materials Engineering, University of Concepción
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Ananthakumar Solaiappan
Materials and Minerals Division, National Institute for Interdisciplinary Science and Technology (NI
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Mouzon Johanne
Division of Engineering Materials, Luleå University of Technology
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LÓPEZ Marta
Department of Materials Engineering, University of Concepción
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CAMURRI Carlos
Department of Materials Engineering, University of Concepción
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ODÉN Magnus
Division of Engineering Materials, Luleå University of Technology
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UMA Kasimayan
Department of Environmental Technology and Urban Planning, Nagoya Institute of Technology
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Uma Kasimayan
Department Of Environment Technology And Urban Planning Nagoya Institute Of Technology
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MANGALARAJA Ramalinga
Department of Materials Engineering, University of Concepción
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CAMURRI Carlos
Department of Materials Engineering, University of Concepción
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ANANTHAKUMAR Solaiappan
Materials and Minerals Division, National Institute for Interdisciplinary Science and Technology (NIIST)
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