Synthesis of monodispersed nanometer-sized YAG powders by a modified coprecipitation method
来源期刊：JOURNAL OF RARE EARTHS2008年第5期
论文作者：ZHANG Jian QIN Xiaoying LI Di PAN Lin
Key words：nanostructured materials; precipitation; yttrium aluminum garnet; agglomeration; iodine; rare earths;
Abstract: Nanometer-sized yttrium aluminum garnet (YAG) powders were synthesized by using the coprecipitation method with ammo-nium hydrogen carbonate as a precipitant. The results indicated that an extremely loose YAG precursor was obtained when iodine was intro-duced in the coprecipitation process on the condition that the initial concentrations of y3+ and AI3+ in the solution were set at 0.018 and 0.03 mol/L, respectively, and pH=8. Consequently, the resulting YAG powders after calcination at 1173 K for 2 h were composed of monodis-persed particles with an average grain size of 30 nm and better sinterability. The present results indicated that the modified coprecipitation method, with iodine as an additive, was superior to the conventional coprecipitation method, to synthesize ultrafine YAG powders.
ZHANG Jian1，QIN Xiaoying1，LI Di1，PAN Lin1
(1.Key Laboratory of Materials Physics,Institute of Solid State Physics Chinese,Academy of Sciences,Hefei 230031,China)
Abstract:Nanometer-sized yttrium aluminum garnet (YAG) powders were synthesized by using the coprecipitation method with ammo-nium hydrogen carbonate as a precipitant. The results indicated that an extremely loose YAG precursor was obtained when iodine was intro-duced in the coprecipitation process on the condition that the initial concentrations of y3+ and AI3+ in the solution were set at 0.018 and 0.03 mol/L, respectively, and pH=8. Consequently, the resulting YAG powders after calcination at 1173 K for 2 h were composed of monodis-persed particles with an average grain size of 30 nm and better sinterability. The present results indicated that the modified coprecipitation method, with iodine as an additive, was superior to the conventional coprecipitation method, to synthesize ultrafine YAG powders.
Key words:nanostructured materials; precipitation; yttrium aluminum garnet; agglomeration; iodine; rare earths;
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